Describe stack-id as an enum

[sdesmalen]

Summary

This patch changes MIR stack-id from an integer to an enum,
and adds printing/parsing support for this in MIR files. The default
stack-id '0' is now renamed to 'default'.

This should make MIR tests that have stack objects with different stack-ids
more descriptive. It also clarifies code operating on StackID.

[arsenm]

include/llvm/CodeGen/MIRYamlMapping.h

316

I think using - instead of _ follows the current naming conventions.

I'm not sure a target specific usage should be put here, but maybe

[thegameg]

This is definitely nicer, thanks for working on it.

I have two concerns about this though:

• we're going from a target-specific "namespace" to a target-independent one, which means in this case that no other target can use the stack id 1
• we're exposing target-specific names and enums in the target-independent code

[sdesmalen]

In D60137#1451655, @thegameg wrote:

This is definitely nicer, thanks for working on it.

I have two concerns about this though:

• we're going from a target-specific "namespace" to a target-independent one, which means in this case that no other target can use the stack id 1
• we're exposing target-specific names and enums in the target-independent code

Thanks! Yes, you're right that exposing the target-specific names/enums in target-independent code is less desirable, although note that this happens in some other places in LLVM as well; think for example of the enum in CallingConv. I made the trade-off to use the enum for several reasons:

• By using an enum way we don't get target-specific MIR parsing of common properties.
• If we want to make it target-independent, we'll need to manually parse it as a string and we lose out on out-of-the box YAML parsing, printing, verification and diagnostics of having an enum value.
• If the value needs to be a string, it will have ugly quotes around it :)
• At the moment there seems to be only very limited use of stack-id, in trunk only the AMDGPU target as far as I know. Unless we care deeply about allowing to programatically generate a range of stack-ids at compile-time (with their meaning only known at compile-time), I don't think it is much of a limitation to have a single namespace.

[sdesmalen]

include/llvm/CodeGen/MIRYamlMapping.h

316

Good point, I'll make sure the next iteration of the patch uses '-' instead!

[sdesmalen]

• Renamed sgpr_spill -> sgpr-spill.
• Renamed TargetStackID::SGPR_Spill -> TargetStackID::SGPRSpill.

[arsenm]

LGTM

include/llvm/CodeGen/MIRYamlMapping.h

 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_MIRYAMLMAPPING_H
 #define LLVM_CODEGEN_MIRYAMLMAPPING_H
 
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/TargetFrameLowering.h"
 #include "llvm/Support/SMLoc.h"
 #include "llvm/Support/YAMLTraits.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cstdint>
 #include <string>
 #include <vector>
 
struct MachineStackObject {
   enum ObjectType { DefaultType, SpillSlot, VariableSized };
   UnsignedValue ID;
   StringValue Name;
   // TODO: Serialize unnamed LLVM alloca reference.
   ObjectType Type = DefaultType;
   int64_t Offset = 0;
   uint64_t Size = 0;
   unsigned Alignment = 0;
-  uint8_t StackID = 0;
+  TargetStackID::Value StackID;
   StringValue CalleeSavedRegister;
   bool CalleeSavedRestored = true;
   Optional<int64_t> LocalOffset;
   StringValue DebugVar;
   StringValue DebugExpr;
   StringValue DebugLoc;
 
   bool operator==(const MachineStackObject &Other) const {
YamlIO.mapOptional("name", Object.Name,
                        StringValue()); // Don't print out an empty name.
     YamlIO.mapOptional(
         "type", Object.Type,
         MachineStackObject::DefaultType); // Don't print the default type.
     YamlIO.mapOptional("offset", Object.Offset, (int64_t)0);
     if (Object.Type != MachineStackObject::VariableSized)
       YamlIO.mapRequired("size", Object.Size);
     YamlIO.mapOptional("alignment", Object.Alignment, (unsigned)0);
-    YamlIO.mapOptional("stack-id", Object.StackID);
+    YamlIO.mapOptional("stack-id", Object.StackID, TargetStackID::Default);
     YamlIO.mapOptional("callee-saved-register", Object.CalleeSavedRegister,
                        StringValue()); // Don't print it out when it's empty.
     YamlIO.mapOptional("callee-saved-restored", Object.CalleeSavedRestored,
                        true);
     YamlIO.mapOptional("local-offset", Object.LocalOffset, Optional<int64_t>());
     YamlIO.mapOptional("debug-info-variable", Object.DebugVar,
                        StringValue()); // Don't print it out when it's empty.
     YamlIO.mapOptional("debug-info-expression", Object.DebugExpr,

 /// MachineFrameInfo class.
 struct FixedMachineStackObject {
   enum ObjectType { DefaultType, SpillSlot };
   UnsignedValue ID;
   ObjectType Type = DefaultType;
   int64_t Offset = 0;
   uint64_t Size = 0;
   unsigned Alignment = 0;
-  uint8_t StackID = 0;
+  TargetStackID::Value StackID;
   bool IsImmutable = false;
   bool IsAliased = false;
   StringValue CalleeSavedRegister;
   bool CalleeSavedRestored = true;
   StringValue DebugVar;
   StringValue DebugExpr;
   StringValue DebugLoc;
 

 struct ScalarEnumerationTraits<FixedMachineStackObject::ObjectType> {
   static void enumeration(yaml::IO &IO,
                           FixedMachineStackObject::ObjectType &Type) {
     IO.enumCase(Type, "default", FixedMachineStackObject::DefaultType);
     IO.enumCase(Type, "spill-slot", FixedMachineStackObject::SpillSlot);
   }
 };
 
+template <>
+struct ScalarEnumerationTraits<TargetStackID::Value> {
+  static void enumeration(yaml::IO &IO, TargetStackID::Value &ID) {
+    IO.enumCase(ID, "default", TargetStackID::Default);
+    IO.enumCase(ID, "sgpr_spill", TargetStackID::SGPR_Spill);
+    IO.enumCase(ID, "noalloc", TargetStackID::NoAlloc);
+  }
+};
+
 template <> struct MappingTraits<FixedMachineStackObject> {
   static void mapping(yaml::IO &YamlIO, FixedMachineStackObject &Object) {
     YamlIO.mapRequired("id", Object.ID);
     YamlIO.mapOptional(
         "type", Object.Type,
         FixedMachineStackObject::DefaultType); // Don't print the default type.
     YamlIO.mapOptional("offset", Object.Offset, (int64_t)0);
     YamlIO.mapOptional("size", Object.Size, (uint64_t)0);
     YamlIO.mapOptional("alignment", Object.Alignment, (unsigned)0);
-    YamlIO.mapOptional("stack-id", Object.StackID);
+    YamlIO.mapOptional("stack-id", Object.StackID, TargetStackID::Default);
     if (Object.Type != FixedMachineStackObject::SpillSlot) {
       YamlIO.mapOptional("isImmutable", Object.IsImmutable, false);
       YamlIO.mapOptional("isAliased", Object.IsAliased, false);
     }
     YamlIO.mapOptional("callee-saved-register", Object.CalleeSavedRegister,
                        StringValue()); // Don't print it out when it's empty.
     YamlIO.mapOptional("callee-saved-restored", Object.CalleeSavedRestored,
                      true);

include/llvm/CodeGen/TargetFrameLowering.h

 //===-- llvm/CodeGen/TargetFrameLowering.h ----------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // Interface to describe the layout of a stack frame on the target machine.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_TARGETFRAMELOWERING_H
 #define LLVM_CODEGEN_TARGETFRAMELOWERING_H
 
 #include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/ADT/StringSwitch.h"
 #include <utility>
 #include <vector>
 
 namespace llvm {
   class BitVector;
   class CalleeSavedInfo;
   class MachineFunction;
   class RegScavenger;
 
+namespace TargetStackID {
+  enum Value {
+    Default = 0,
+    SGPR_Spill = 1,
+    NoAlloc = 255
+  };
+}
+
 /// Information about stack frame layout on the target.  It holds the direction
 /// of stack growth, the known stack alignment on entry to each function, and
 /// the offset to the locals area.
 ///
 /// The offset to the local area is the offset from the stack pointer on
 /// function entry to the first location where function data (local variables,
 /// spill locations) can be stored.
 class TargetFrameLowering {
public:
   /// \p MBB will be correctly handled by the target.
   /// As soon as the target enable shrink-wrapping without overriding
   /// this method, we assume that each basic block is a valid
   /// epilogue.
   virtual bool canUseAsEpilogue(const MachineBasicBlock &MBB) const {
     return true;
   }
 
+  virtual bool isSupportedStackID(TargetStackID::Value ID) const {
+    switch (ID) {
+    default:
+      return false;
+    case TargetStackID::Default:
+    case TargetStackID::NoAlloc:
+      return true;
+    }
+  }
+
   /// Check if given function is safe for not having callee saved registers.
   /// This is used when interprocedural register allocation is enabled.
   static bool isSafeForNoCSROpt(const Function &F) {
     if (!F.hasLocalLinkage() || F.hasAddressTaken() ||
         !F.hasFnAttribute(Attribute::NoRecurse))
       return false;
     // Function should not be optimized as tail call.
     for (const User *U : F.users())

lib/CodeGen/MIRParser/MIRParser.cpp

 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
 #include "llvm/CodeGen/MIRParser/MIParser.h"
 #include "llvm/CodeGen/MIRYamlMapping.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/TargetFrameLowering.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/ValueSymbolTable.h"
 #include "llvm/Support/LineIterator.h"
bool MIRParserImpl::setupRegisterInfo(const PerFunctionMIParsingState &PFS,
 
   return Error;
 }
 
 bool MIRParserImpl::initializeFrameInfo(PerFunctionMIParsingState &PFS,
                                         const yaml::MachineFunction &YamlMF) {
   MachineFunction &MF = PFS.MF;
   MachineFrameInfo &MFI = MF.getFrameInfo();
+  const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
   const Function &F = MF.getFunction();
   const yaml::MachineFrameInfo &YamlMFI = YamlMF.FrameInfo;
   MFI.setFrameAddressIsTaken(YamlMFI.IsFrameAddressTaken);
   MFI.setReturnAddressIsTaken(YamlMFI.IsReturnAddressTaken);
   MFI.setHasStackMap(YamlMFI.HasStackMap);
   MFI.setHasPatchPoint(YamlMFI.HasPatchPoint);
   MFI.setStackSize(YamlMFI.StackSize);
   MFI.setOffsetAdjustment(YamlMFI.OffsetAdjustment);
bool MIRParserImpl::initializeFrameInfo(PerFunctionMIParsingState &PFS,
   // Initialize the fixed frame objects.
   for (const auto &Object : YamlMF.FixedStackObjects) {
     int ObjectIdx;
     if (Object.Type != yaml::FixedMachineStackObject::SpillSlot)
       ObjectIdx = MFI.CreateFixedObject(Object.Size, Object.Offset,
                                         Object.IsImmutable, Object.IsAliased);
     else
       ObjectIdx = MFI.CreateFixedSpillStackObject(Object.Size, Object.Offset);
+
+    if (!TFI->isSupportedStackID(Object.StackID))
+      return error(Object.ID.SourceRange.Start,
+                   Twine("StackID is not supported by target"));
     MFI.setStackID(ObjectIdx, Object.StackID);
     MFI.setObjectAlignment(ObjectIdx, Object.Alignment);
     if (!PFS.FixedStackObjectSlots.insert(std::make_pair(Object.ID.Value,
                                                          ObjectIdx))
              .second)
       return error(Object.ID.SourceRange.Start,
                    Twine("redefinition of fixed stack object '%fixed-stack.") +
                        Twine(Object.ID.Value) + "'");
if (!Name.Value.empty()) {
       Alloca = dyn_cast_or_null<AllocaInst>(
           F.getValueSymbolTable()->lookup(Name.Value));
       if (!Alloca)
         return error(Name.SourceRange.Start,
                      "alloca instruction named '" + Name.Value +
                          "' isn't defined in the function '" + F.getName() +
                          "'");
     }
+    if (!TFI->isSupportedStackID(Object.StackID))
+      return error(Object.ID.SourceRange.Start,
+                   Twine("StackID is not supported by target"));
     if (Object.Type == yaml::MachineStackObject::VariableSized)
       ObjectIdx = MFI.CreateVariableSizedObject(Object.Alignment, Alloca);
     else
       ObjectIdx = MFI.CreateStackObject(
           Object.Size, Object.Alignment,
           Object.Type == yaml::MachineStackObject::SpillSlot, Alloca,
           Object.StackID);
     MFI.setObjectOffset(ObjectIdx, Object.Offset);

lib/CodeGen/MIRPrinter.cpp

 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
 #include "llvm/CodeGen/MachineOperand.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/PseudoSourceValue.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
 #include "llvm/CodeGen/TargetRegisterInfo.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/CodeGen/TargetFrameLowering.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/DebugLoc.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/InstrTypes.h"
for (int I = MFI.getObjectIndexBegin(); I < 0; ++I, ++ID) {
     yaml::FixedMachineStackObject YamlObject;
     YamlObject.ID = ID;
     YamlObject.Type = MFI.isSpillSlotObjectIndex(I)
                           ? yaml::FixedMachineStackObject::SpillSlot
                           : yaml::FixedMachineStackObject::DefaultType;
     YamlObject.Offset = MFI.getObjectOffset(I);
     YamlObject.Size = MFI.getObjectSize(I);
     YamlObject.Alignment = MFI.getObjectAlignment(I);
-    YamlObject.StackID = MFI.getStackID(I);
+    YamlObject.StackID = (TargetStackID::Value)MFI.getStackID(I);
     YamlObject.IsImmutable = MFI.isImmutableObjectIndex(I);
     YamlObject.IsAliased = MFI.isAliasedObjectIndex(I);
     YMF.FixedStackObjects.push_back(YamlObject);
     StackObjectOperandMapping.insert(
         std::make_pair(I, FrameIndexOperand::createFixed(ID)));
   }
 
   // Process ordinary stack objects.
for (int I = 0, E = MFI.getObjectIndexEnd(); I < E; ++I, ++ID) {
     YamlObject.Type = MFI.isSpillSlotObjectIndex(I)
                           ? yaml::MachineStackObject::SpillSlot
                           : MFI.isVariableSizedObjectIndex(I)
                                 ? yaml::MachineStackObject::VariableSized
                                 : yaml::MachineStackObject::DefaultType;
     YamlObject.Offset = MFI.getObjectOffset(I);
     YamlObject.Size = MFI.getObjectSize(I);
     YamlObject.Alignment = MFI.getObjectAlignment(I);
-    YamlObject.StackID = MFI.getStackID(I);
+    YamlObject.StackID = (TargetStackID::Value)MFI.getStackID(I);
 
     YMF.StackObjects.push_back(YamlObject);
     StackObjectOperandMapping.insert(std::make_pair(
         I, FrameIndexOperand::create(YamlObject.Name.Value, ID)));
   }
 
   for (const auto &CSInfo : MFI.getCalleeSavedInfo()) {
     yaml::StringValue Reg;

lib/CodeGen/MachineFrameInfo.cpp

unsigned MachineFrameInfo::estimateStackSize(const MachineFunction &MF) const {
   int Offset = 0;
 
   // This code is very, very similar to PEI::calculateFrameObjectOffsets().
   // It really should be refactored to share code. Until then, changes
   // should keep in mind that there's tight coupling between the two.
 
   for (int i = getObjectIndexBegin(); i != 0; ++i) {
     // Only estimate stack size of default stack.
-    if (getStackID(i))
+    if (getStackID(i) != TargetStackID::Default)
       continue;
     int FixedOff = -getObjectOffset(i);
     if (FixedOff > Offset) Offset = FixedOff;
   }
   for (unsigned i = 0, e = getObjectIndexEnd(); i != e; ++i) {
     // Only estimate stack size of live objects on default stack.
-    if (isDeadObjectIndex(i) || getStackID(i))
+    if (isDeadObjectIndex(i) || getStackID(i) != TargetStackID::Default)
       continue;
     Offset += getObjectSize(i);
     unsigned Align = getObjectAlignment(i);
     // Adjust to alignment boundary
     Offset = (Offset+Align-1)/Align*Align;
 
     MaxAlign = std::max(Align, MaxAlign);
   }

lib/CodeGen/PrologEpilogInserter.cpp

if (FixedCSEnd > std::numeric_limits<int>::max())
     return;
 
   StackBytesFree.resize(FixedCSEnd, true);
 
   SmallVector<int, 16> AllocatedFrameSlots;
   // Add fixed objects.
   for (int i = MFI.getObjectIndexBegin(); i != 0; ++i)
     // StackSlot scavenging is only implemented for the default stack.
-    if (MFI.getStackID(i) == 0)
+    if (MFI.getStackID(i) == TargetStackID::Default)
       AllocatedFrameSlots.push_back(i);
   // Add callee-save objects.
   for (int i = MinCSFrameIndex; i <= (int)MaxCSFrameIndex; ++i)
-    if (MFI.getStackID(i) == 0)
+    if (MFI.getStackID(i) == TargetStackID::Default)
       AllocatedFrameSlots.push_back(i);
 
   for (int i : AllocatedFrameSlots) {
     // These are converted from int64_t, but they should always fit in int
     // because of the FixedCSEnd check above.
     int ObjOffset = MFI.getObjectOffset(i);
     int ObjSize = MFI.getObjectSize(i);
     int ObjStart, ObjEnd;
assert(LocalAreaOffset >= 0
          && "Local area offset should be in direction of stack growth");
   int64_t Offset = LocalAreaOffset;
 
   // Skew to be applied to alignment.
   unsigned Skew = TFI.getStackAlignmentSkew(MF);
 
 #ifdef EXPENSIVE_CHECKS
   for (unsigned i = 0, e = MFI.getObjectIndexEnd(); i != e; ++i)
-    if (!MFI.isDeadObjectIndex(i) && MFI.getStackID(i) == 0)
+    if (!MFI.isDeadObjectIndex(i) &&
+        MFI.getStackID(i) == TargetStackID::Default)
       assert(MFI.getObjectAlignment(i) <= MFI.getMaxAlignment() &&
              "MaxAlignment is invalid");
 #endif
 
   // If there are fixed sized objects that are preallocated in the local area,
   // non-fixed objects can't be allocated right at the start of local area.
   // Adjust 'Offset' to point to the end of last fixed sized preallocated
   // object.
   for (int i = MFI.getObjectIndexBegin(); i != 0; ++i) {
-    if (MFI.getStackID(i)) // Only allocate objects on the default stack.
+    if (MFI.getStackID(i) !=
+        TargetStackID::Default) // Only allocate objects on the default stack.
       continue;
 
     int64_t FixedOff;
     if (StackGrowsDown) {
       // The maximum distance from the stack pointer is at lower address of
       // the object -- which is given by offset. For down growing stack
       // the offset is negative, so we negate the offset to get the distance.
       FixedOff = -MFI.getObjectOffset(i);
     } else {
       // The maximum distance from the start pointer is at the upper
       // address of the object.
       FixedOff = MFI.getObjectOffset(i) + MFI.getObjectSize(i);
     }
     if (FixedOff > Offset) Offset = FixedOff;
   }
 
   // First assign frame offsets to stack objects that are used to spill
   // callee saved registers.
   if (StackGrowsDown) {
     for (unsigned i = MinCSFrameIndex; i <= MaxCSFrameIndex; ++i) {
-      if (MFI.getStackID(i)) // Only allocate objects on the default stack.
+      if (MFI.getStackID(i) !=
+          TargetStackID::Default) // Only allocate objects on the default stack.
         continue;
 
       // If the stack grows down, we need to add the size to find the lowest
       // address of the object.
       Offset += MFI.getObjectSize(i);
 
       unsigned Align = MFI.getObjectAlignment(i);
       // Adjust to alignment boundary
       Offset = alignTo(Offset, Align, Skew);
 
       LLVM_DEBUG(dbgs() << "alloc FI(" << i << ") at SP[" << -Offset << "]\n");
       MFI.setObjectOffset(i, -Offset);        // Set the computed offset
     }
   } else if (MaxCSFrameIndex >= MinCSFrameIndex) {
     // Be careful about underflow in comparisons agains MinCSFrameIndex.
     for (unsigned i = MaxCSFrameIndex; i != MinCSFrameIndex - 1; --i) {
-      if (MFI.getStackID(i)) // Only allocate objects on the default stack.
+      if (MFI.getStackID(i) !=
+          TargetStackID::Default) // Only allocate objects on the default stack.
         continue;
 
       if (MFI.isDeadObjectIndex(i))
         continue;
 
       unsigned Align = MFI.getObjectAlignment(i);
       // Adjust to alignment boundary
       Offset = alignTo(Offset, Align, Skew);
for (unsigned i = 0, e = MFI.getObjectIndexEnd(); i != e; ++i) {
         continue;
       if (RS && RS->isScavengingFrameIndex((int)i))
         continue;
       if (MFI.isDeadObjectIndex(i))
         continue;
       if (MFI.getStackProtectorIndex() == (int)i ||
           EHRegNodeFrameIndex == (int)i)
         continue;
-      if (MFI.getStackID(i)) // Only allocate objects on the default stack.
+      if (MFI.getStackID(i) !=
+          TargetStackID::Default) // Only allocate objects on the default stack.
         continue;
 
       switch (MFI.getObjectSSPLayout(i)) {
       case MachineFrameInfo::SSPLK_None:
         continue;
       case MachineFrameInfo::SSPLK_SmallArray:
         SmallArrayObjs.insert(i);
         continue;
if (RS && RS->isScavengingFrameIndex((int)i))
       continue;
     if (MFI.isDeadObjectIndex(i))
       continue;
     if (MFI.getStackProtectorIndex() == (int)i ||
         EHRegNodeFrameIndex == (int)i)
       continue;
     if (ProtectedObjs.count(i))
       continue;
-    if (MFI.getStackID(i)) // Only allocate objects on the default stack.
+    if (MFI.getStackID(i) !=
+        TargetStackID::Default) // Only allocate objects on the default stack.
       continue;
 
     // Add the objects that we need to allocate to our working set.
     ObjectsToAllocate.push_back(i);
   }
 
   // Allocate the EH registration node first if one is present.
   if (EHRegNodeFrameIndex != std::numeric_limits<int>::max())

lib/Target/AMDGPU/SIDefines.h

enum OperandType : unsigned {
     OPERAND_SDWA_VOPC_DST,
 
     /// Operand with 32-bit immediate that uses the constant bus.
     OPERAND_KIMM32,
     OPERAND_KIMM16
   };
 }
 
-namespace SIStackID {
-enum StackTypes : uint8_t {
-  SCRATCH = 0,
-  SGPR_SPILL = 1
-};
-}
-
 // Input operand modifiers bit-masks
 // NEG and SEXT share same bit-mask because they can't be set simultaneously.
 namespace SISrcMods {
   enum : unsigned {
    NEG = 1 << 0,   // Floating-point negate modifier
    ABS = 1 << 1,   // Floating-point absolute modifier
    SEXT = 1 << 0,  // Integer sign-extend modifier
    NEG_HI = ABS,   // Floating-point negate high packed component modifier.

lib/Target/AMDGPU/SIFrameLowering.h

public:
   void emitEpilogue(MachineFunction &MF,
                     MachineBasicBlock &MBB) const override;
   int getFrameIndexReference(const MachineFunction &MF, int FI,
                              unsigned &FrameReg) const override;
 
   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                             RegScavenger *RS = nullptr) const override;
 
+  bool isSupportedStackID(TargetStackID::Value ID) const override;
+
   void processFunctionBeforeFrameFinalized(
     MachineFunction &MF,
     RegScavenger *RS = nullptr) const override;
 
   MachineBasicBlock::iterator
   eliminateCallFramePseudoInstr(MachineFunction &MF,
                                 MachineBasicBlock &MBB,
                                 MachineBasicBlock::iterator MI) const override;

lib/Target/AMDGPU/SIFrameLowering.cpp

static unsigned findScratchNonCalleeSaveRegister(MachineBasicBlock &MBB) {
   for (unsigned Reg : AMDGPU::SReg_32_XM0RegClass) {
     if (LiveRegs.available(MRI, Reg))
       return Reg;
   }
 
   return AMDGPU::NoRegister;
 }
 
+bool SIFrameLowering::isSupportedStackID(TargetStackID::Value ID) const {
+    switch (ID) {
+    default:
+      return false;
+    case TargetStackID::Default:
+    case TargetStackID::NoAlloc:
+    case TargetStackID::SGPR_Spill:
+      return true;
+    }
+}
+
 void SIFrameLowering::emitPrologue(MachineFunction &MF,
                                    MachineBasicBlock &MBB) const {
   SIMachineFunctionInfo *FuncInfo = MF.getInfo<SIMachineFunctionInfo>();
   if (FuncInfo->isEntryFunction()) {
     emitEntryFunctionPrologue(MF, MBB);
     return;
   }
 
if (TRI.spillSGPRToVGPR() && FuncInfo->hasSpilledSGPRs()) {
     for (MachineBasicBlock &MBB : MF) {
       MachineBasicBlock::iterator Next;
       for (auto I = MBB.begin(), E = MBB.end(); I != E; I = Next) {
         MachineInstr &MI = *I;
         Next = std::next(I);
 
         if (TII->isSGPRSpill(MI)) {
           int FI = TII->getNamedOperand(MI, AMDGPU::OpName::addr)->getIndex();
-          assert(MFI.getStackID(FI) == SIStackID::SGPR_SPILL);
+          assert(MFI.getStackID(FI) == TargetStackID::SGPR_Spill);
           if (FuncInfo->allocateSGPRSpillToVGPR(MF, FI)) {
             bool Spilled = TRI.eliminateSGPRToVGPRSpillFrameIndex(MI, FI, RS);
             (void)Spilled;
             assert(Spilled && "failed to spill SGPR to VGPR when allocated");
           } else
             AllSGPRSpilledToVGPRs = false;
         }
       }

lib/Target/AMDGPU/SIInstrInfo.cpp

MachineInstrBuilder Spill = BuildMI(MBB, MI, DL, OpDesc)
       .addFrameIndex(FrameIndex)               // addr
       .addMemOperand(MMO)
       .addReg(MFI->getScratchRSrcReg(), RegState::Implicit)
       .addReg(MFI->getFrameOffsetReg(), RegState::Implicit);
     // Add the scratch resource registers as implicit uses because we may end up
     // needing them, and need to ensure that the reserved registers are
     // correctly handled.
 
-    FrameInfo.setStackID(FrameIndex, SIStackID::SGPR_SPILL);
+    FrameInfo.setStackID(FrameIndex, TargetStackID::SGPR_Spill);
     if (ST.hasScalarStores()) {
       // m0 is used for offset to scalar stores if used to spill.
       Spill.addReg(AMDGPU::M0, RegState::ImplicitDefine | RegState::Dead);
     }
 
     return;
   }
 
if (RI.isSGPRClass(RC)) {
     // FIXME: Maybe this should not include a memoperand because it will be
     // lowered to non-memory instructions.
     const MCInstrDesc &OpDesc = get(getSGPRSpillRestoreOpcode(SpillSize));
     if (TargetRegisterInfo::isVirtualRegister(DestReg) && SpillSize == 4) {
       MachineRegisterInfo &MRI = MF->getRegInfo();
       MRI.constrainRegClass(DestReg, &AMDGPU::SReg_32_XM0RegClass);
     }
 
-    FrameInfo.setStackID(FrameIndex, SIStackID::SGPR_SPILL);
+    FrameInfo.setStackID(FrameIndex, TargetStackID::SGPR_Spill);
     MachineInstrBuilder Spill = BuildMI(MBB, MI, DL, OpDesc, DestReg)
       .addFrameIndex(FrameIndex) // addr
       .addMemOperand(MMO)
       .addReg(MFI->getScratchRSrcReg(), RegState::Implicit)
       .addReg(MFI->getFrameOffsetReg(), RegState::Implicit);
 
     if (ST.hasScalarStores()) {
       // m0 is used for offset to scalar stores if used to spill.

test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll

define i64 @muli64(i64 %arg1, i64 %arg2) {
   %res = mul i64 %arg1, %arg2
   ret i64 %res
 }
 
 ; Tests for alloca
 ; CHECK-LABEL: name: allocai64
 ; CHECK: stack:
 ; CHECK-NEXT:   - { id: 0, name: ptr1, type: default, offset: 0, size: 8, alignment: 8,
-; CHECK-NEXT:       stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+; CHECK-NEXT:       stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 ; CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 ; CHECK-NEXT:   - { id: 1, name: ptr2, type: default, offset: 0, size: 8, alignment: 1,
-; CHECK-NEXT:       stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+; CHECK-NEXT:       stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 ; CHECK-NEXT:       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 ; CHECK-NEXT:   - { id: 2, name: ptr3, type: default, offset: 0, size: 128, alignment: 8,
-; CHECK-NEXT:       stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+; CHECK-NEXT:       stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 ; CHECK-NEXT:       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 ; CHECK-NEXT:   - { id: 3, name: ptr4, type: default, offset: 0, size: 1, alignment: 8,
 ; CHECK: %{{[0-9]+}}:_(p0) = G_FRAME_INDEX %stack.0.ptr1
 ; CHECK: %{{[0-9]+}}:_(p0) = G_FRAME_INDEX %stack.1.ptr2
 ; CHECK: %{{[0-9]+}}:_(p0) = G_FRAME_INDEX %stack.2.ptr3
 ; CHECK: %{{[0-9]+}}:_(p0) = G_FRAME_INDEX %stack.3.ptr4
 define void @allocai64() {
   %ptr1 = alloca i64

test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir

 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }
 frameInfo:
   maxAlignment:    2
 stack:
-  - { id: 0, name: p.addr, size: 2, alignment: 2, stack-id: 0 }
+  - { id: 0, name: p.addr, size: 2, alignment: 2, stack-id: default }
 body:             |
   bb.1.entry:
     liveins: $h0
 
     %0(s16) = COPY $h0
     %1(p0) = G_FRAME_INDEX %stack.0.p.addr
     G_STORE %0(s16), %1(p0) :: (store 2 into %ir.p.addr)
     %2(s16) = G_LOAD %1(p0) :: (load 2 from %ir.p.addr)
     $h0 = COPY %2(s16)
     RET_ReallyLR implicit $h0
 
 ...

test/CodeGen/AArch64/GlobalISel/call-translator.ll

 ; CHECK: ADJCALLSTACKUP 24, 0, implicit-def $sp, implicit $sp
 define void @test_call_stack() {
   call void @test_stack_slots([8 x i64] undef, i64 42, i64 12, i64* null)
   ret void
 }
 
 ; CHECK-LABEL: name: test_mem_i1
 ; CHECK: fixedStack:
-; CHECK-NEXT: - { id: [[SLOT:[0-9]+]], type: default, offset: 0, size: 1, alignment: 16, stack-id: 0,
+; CHECK-NEXT: - { id: [[SLOT:[0-9]+]], type: default, offset: 0, size: 1, alignment: 16, stack-id: default,
 ; CHECK-NEXT: isImmutable: true,
 ; CHECK: [[ADDR:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.[[SLOT]]
 ; CHECK: {{%[0-9]+}}:_(s1) = G_LOAD [[ADDR]](p0) :: (invariant load 1 from %fixed-stack.[[SLOT]])
 define void @test_mem_i1([8 x i64], i1 %in) {
   ret void
 }
 
 ; CHECK-LABEL: name: test_128bit_struct

test/CodeGen/AArch64/GlobalISel/fp128-legalize-crash-pr35690.mir

 exposesReturnsTwice: false
 legalized:       false
 regBankSelected: false
 selected:        false
 tracksRegLiveness: true
 fixedStack:      
 stack:           
   - { id: 0, name: a.addr, type: default, offset: 0, size: 16, alignment: 16, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 body:             |
   bb.1.entry:
     liveins: $q0
 
     ; This test just checks we don't crash on G_FNEG of FP128 types. Expect to fall
     ; back until support is added for fp128.

test/CodeGen/AArch64/GlobalISel/legalize-load-vector.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
 stack:           
   - { id: 0, name: __ret.i, type: default, offset: 0, size: 8, alignment: 8, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       
 body:             |
   bb.1.entry:
     liveins: $x0
   
     %0:_(p0) = COPY $x0
     %1:_(<4 x s16>) = G_LOAD %0:_(p0) :: (load 8 from %ir.__ret.i)
     $x1 = COPY %1(<4 x s16>)
 
 ...

test/CodeGen/AArch64/GlobalISel/select-gv-cmodel-large.mir

 
 ...
 ---
 name:            gv_large
 legalized:       true
 regBankSelected: true
 stack:
   - { id: 0, name: retval, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.1:
     ; CHECK-LABEL: name: gv_large
     ; CHECK: [[MOVZXi:%[0-9]+]]:gpr64 = MOVZXi target-flags(aarch64-g0, aarch64-nc) @foo1, 0
     ; CHECK: [[MOVKXi:%[0-9]+]]:gpr64 = MOVKXi [[MOVZXi]], target-flags(aarch64-g1, aarch64-nc) @foo1, 16

test/CodeGen/AArch64/GlobalISel/select-gv-cmodel-tiny.mir

 
 ...
 ---
 name:            gv_tiny
 legalized:       true
 regBankSelected: true
 stack:
   - { id: 0, name: retval, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.1:
     ; CHECK-LABEL: name: gv_tiny
     ; CHECK: [[ADR:%[0-9]+]]:gpr64 = ADR @foo1
     ; CHECK: [[COPY:%[0-9]+]]:gpr64sp = COPY [[ADR]]

test/CodeGen/AArch64/branch-target-enforcment.mir

bb.0.entry:
     RET undef $lr, implicit killed $w0
 
 ---
 # Function starts with PACIASP, which implicitly acts as BTI JC, so no change
 # needed.
 name:            ptr_auth
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -16, size: 8, alignment: 16,
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 body:             |
   bb.0.entry:
     liveins: $lr
 
     ; CHECK-LABEL: name: ptr_auth
     ; CHECK-NOT: HINT
     ; CHECK: frame-setup PACIASP
     ; CHECK-NOT: HINT
     ; CHECK: RETAA
     frame-setup PACIASP implicit-def $lr, implicit killed $lr, implicit $sp
     early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 :: (store 8 into %stack.0)
     INLINEASM &"", 1, 12, implicit-def dead early-clobber $lr
     $w0 = ORRWrs $wzr, $wzr, 0
     early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 16 :: (load 8 from %stack.0)
     RETAA implicit killed $w0
 
 ---
 # Function starts with PACIBSP, which implicitly acts as BTI JC, so no change
 # needed.
 name:            ptr_auth_b
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -16, size: 8, alignment: 16,
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 body:             |
   bb.0.entry:
     liveins: $lr
 
     ; CHECK-LABEL: name: ptr_auth_b
     ; CHECK-NOT: HINT
     ; CHECK: frame-setup PACIBSP

test/CodeGen/AArch64/cfi_restore.mir

 # RUN: llc -mtriple=aarch64-- -start-after prologepilog -o - %s | FileCheck %s
 ---
 name:            fun
 # CHECK: .cfi_startproc
 tracksRegLiveness: true
 frameInfo:
   stackSize:       16
   maxAlignment:    8
   hasCalls:        true
 stack:
-  - { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: 0,
+  - { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$lr' }
-  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0,
+  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$fp' }
 body:             |
   bb.0:
     liveins: $fp, $lr
 
     $sp = frame-setup SUBXri $sp, 16, 0
     frame-setup STRXui killed $fp, $sp, 0 :: (store 8 into %stack.1)
     frame-setup CFI_INSTRUCTION offset $w29, -16

test/CodeGen/AArch64/reverse-csr-restore-seq.mir

; AFTERLDSTOPT-NEXT: early-clobber $sp, $x26, $x25 = frame-destroy LDPXpost $sp, 8
     RET_ReallyLR
 ...
 ---
 name:            bar
 # CHECK-LABEL: name: bar
 tracksRegLiveness: true
 stack:
   - { id : 0, size: 8, alignment: 4,
-  stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+  stack-id: default, callee-saved-register: '', callee-saved-restored: true,
   local-offset: -4, debug-info-variable: '', debug-info-expression: '',
   debug-info-location: '' }
 
 body:             |
   bb.0:
     $x19 = IMPLICIT_DEF
     $x20 = IMPLICIT_DEF
     $x21 = IMPLICIT_DEF

test/CodeGen/AArch64/spill-stack-realignment.mir

 # RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass=prologepilog %s -o - | FileCheck %s
 
 # Ensure references to scavenged stack slots in the CSR area use the
 # FP as a base when the stack pointer must be aligned to something
 # larger than required by the target. This is necessary because the
 # alignment padding area is between the CSR area and the SP, so the SP
 # cannot be used to reference the CSR area.
 name:            test
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    64
 # CHECK:      stack:
 # CHECK:        id: 0, name: '', type: default, offset: -64, size: 4, alignment: 64
-# CHECK-NEXT:     stack-id: 0
+# CHECK-NEXT:     stack-id: default
 # CHECK-NEXT:     local-offset: -64
 # CHECK:        id: 1, name: '', type: default, offset: -20, size: 4, alignment: 4
-# CHECK-NEXT:     stack-id: 0
+# CHECK-NEXT:     stack-id: default
 # CHECK-NEXT:     local-offset: -68
 stack:
   - { id: 0, size: 4, alignment: 64, local-offset: -64 }
   - { id: 1, size: 4, alignment: 4, local-offset: -68 }
 
 # CHECK: body:
 # CHECK:   $sp = ANDXri killed ${{x[0-9]+}}, 7865
 # CHECK:   STRSui $s0, $sp, 0

test/CodeGen/AArch64/stack-id-pei-alloc.mir

 # RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass=prologepilog %s -o - | FileCheck %s
 ...
 # Ensure that objects with StackID > 0 are not allocated on the default stack
 # (will not be allocated an offset) and are not considered in the calculation of
 # the StackSize.
 # CHECK:      name: test_allocate
 # CHECK:      stackSize: 16
 # CHECK:      stack:
 # CHECK:        id: 0, name: '', type: default, offset: -8, size: 8, alignment: 8,
-# CHECK-NEXT:   stack-id: 0
+# CHECK-NEXT:   stack-id: default
 # CHECK:        id: 1, name: '', type: default, offset: -16, size: 8, alignment: 8,
-# CHECK-NEXT:   stack-id: 0
+# CHECK-NEXT:   stack-id: default
 # CHECK:        id: 2, name: '', type: default, offset: 0, size: 8, alignment: 8,
-# CHECK-NEXT:   stack-id: 42
+# CHECK-NEXT:   stack-id: noalloc
 name:            test_allocate
 frameInfo:
   maxAlignment:  16
 stack:
-  - { id: 0, stack-id: 0, size: 8, alignment: 8, offset: 0 }
-  - { id: 1, stack-id: 0, size: 8, alignment: 8, offset: 0 }
-  - { id: 2, stack-id: 42, size: 8, alignment: 8, offset: 0 }
+  - { id: 0, stack-id: default, size: 8, alignment: 8, offset: 0 }
+  - { id: 1, stack-id: default, size: 8, alignment: 8, offset: 0 }
+  - { id: 2, stack-id: noalloc, size: 8, alignment: 8, offset: 0 }
 body:             |
   bb.0.entry:
     RET_ReallyLR
 ---
 ...
 # Ensure MaxAlignment becomes '32' even though we also have an object
 # with alignment of 64. MaxAlignment only pertains to the default stack
 # (StackID 0), so objects associated with a different StackID should
 # not be considered.
 #
 # CHECK: name: test_maxalign
 # CHECK: maxAlignment: 32
 name:            test_maxalign
 frameInfo:
   maxAlignment:  16
 stack:
-  - { id: 0, stack-id: 0, size: 16, alignment: 32 }
-  - { id: 1, stack-id: 42, size: 16, alignment: 64 }
+  - { id: 0, stack-id: default, size: 16, alignment: 32 }
+  - { id: 1, stack-id: noalloc, size: 16, alignment: 64 }
 body:             |
   bb.0.entry:
     RET_ReallyLR
 ---
 ...
 # CHECK: name: test_maxalign_fixedstack
 # CHECK: maxAlignment: 32
 name:            test_maxalign_fixedstack
 frameInfo:
   maxAlignment:  16
 fixedStack:
-  - { id: 0, stack-id: 0, size: 16, alignment: 32 }
-  - { id: 1, stack-id: 42, size: 16, alignment: 64 }
+  - { id: 0, stack-id: default, size: 16, alignment: 32 }
+  - { id: 1, stack-id: noalloc, size: 16, alignment: 64 }
 body:             |
   bb.0.entry:
     RET_ReallyLR
 ---

test/CodeGen/AArch64/stack-id-stackslot-scavenging.mir

 # RUN: llc -mtriple=aarch64-none-linux-gnu -start-before=greedy -stop-after=prologepilog %s -o - | FileCheck %s
 ...
 # Ensure that an object with a different stack-id is not allocated to a
 # callee-save slot using stack-slot scavenging. This test saves X28 which
 # creates a hole in the CSR stack region, but it should not be saved to.
 # Instead of saving to SP + 1 (which would be the hole in the region), it
 # should save to SP + 2 (since AArch64 codegen currently does not support
 # (and thus allocate) objects with a stack-id > 0).
 name:            test_no_stackslot_scavenging
 # CHECK: name: test_no_stackslot_scavenging
 # CHECK: STRXui $x0, $sp, 2
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:  16
 stack:
-  - { id: 0, stack-id: 42, size: 8, alignment: 8 }
+  - { id: 0, stack-id: noalloc, size: 8, alignment: 8 }
 body:             |
   bb.0.entry:
     liveins: $x0
     STRXui $x0, %stack.0, 0
     ; Force preserve a CSR to create a hole in the CSR stack region.
     $x28 = IMPLICIT_DEF
     RET_ReallyLR
 ---

test/CodeGen/AArch64/wineh-frame5.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  492
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: B, type: default, offset: 0, size: 492, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -492, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.1(0x40000000), %bb.2(0x40000000)
     liveins: $w0
 

test/CodeGen/AArch64/wineh-frame6.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  24
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: c.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: b.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -8, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: idx.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -12, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, name: n.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -16, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, name: a, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 5, name: '', type: variable-sized, offset: 0,
-      alignment: 1, stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      alignment: 1, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     liveins: $w0, $w1, $w2, $w3
 
     STRWui killed renamable $w3, %stack.0.c.addr, 0 :: (store 4 into %ir.c.addr)
     STRWui killed renamable $w2, %stack.1.b.addr, 0 :: (store 4 into %ir.b.addr)

test/CodeGen/AArch64/wineh-frame7.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  2993276
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: retval, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: i.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -8, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: A, type: default, offset: 0, size: 2992772, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2992780, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, name: a, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2992784, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, name: B, type: default, offset: 0, size: 492, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2993276, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.1.entry:
     successors: %bb.2(0x40000000), %bb.3(0x40000000)
     liveins: $w0
 
     renamable $x8 = ADDXri %stack.1.i.addr, 0, 0

test/CodeGen/AArch64/wineh-frame8.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  8
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: a.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: b, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -8, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.1.entry:
     liveins: $w0
 
     renamable $w8 = MOVi32imm 2
     STRWui killed renamable $w0, %stack.0.a.addr, 0 :: (store 4 into %ir.a.addr)
     STRWui killed renamable $w8, %stack.1.b, 0 :: (store 4 into %ir.b)
     renamable $w8 = LDRWui %stack.1.b, 0 :: (load 4 from %ir.b)
     renamable $w0 = LDRWui %stack.0.a.addr, 0 :: (load 4 from %ir.a.addr)
     renamable $w0 = nsw ADDWrr killed renamable $w8, killed renamable $w0
     RET_ReallyLR implicit killed $w0
 
 ...

test/CodeGen/AArch64/wineh1.mir

 liveins:
   - { reg: '$w0' }
 frameInfo:
   stackSize:       80
   maxAlignment:    8
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: true
 stack:
-  - { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: 0,
+  - { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x19' }
-  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0,
+  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x20' }
-  - { id: 2, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0,
+  - { id: 2, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x21' }
-  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 8, stack-id: 0,
+  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x22' }
-  - { id: 4, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: 0,
+  - { id: 4, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x23' }
-  - { id: 5, type: spill-slot, offset: -48, size: 8, alignment: 8, stack-id: 0,
+  - { id: 5, type: spill-slot, offset: -48, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x24' }
-  - { id: 6, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: 0,
+  - { id: 6, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x25' }
-  - { id: 7, type: spill-slot, offset: -64, size: 8, alignment: 8, stack-id: 0,
+  - { id: 7, type: spill-slot, offset: -64, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x26' }
-  - { id: 8, type: spill-slot, offset: -72, size: 8, alignment: 8, stack-id: 0,
+  - { id: 8, type: spill-slot, offset: -72, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x27' }
-  - { id: 9, type: spill-slot, offset: -80, size: 8, alignment: 8, stack-id: 0,
+  - { id: 9, type: spill-slot, offset: -80, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x28' }
 body:             |
   bb.0.entry:
     liveins: $x0, $x1, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
     early-clobber $sp = frame-setup STPXpre killed $x27, killed $x28, $sp, -10 :: (store 8 into %stack.8), (store 8 into %stack.9)
     frame-setup SEH_SaveRegP_X 27, 28, -80
     frame-setup STPXi killed $x25, killed $x26, $sp, 2 :: (store 8 into %stack.6), (store 8 into %stack.7)
     frame-setup SEH_SaveRegP 25, 26, 16

test/CodeGen/AArch64/wineh2.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x19', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x20', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x21', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x22', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x23', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x23', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x24', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x24', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x25', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x25', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x26', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x26', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x27', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x27', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 9, name: '', type: spill-slot, offset: -80, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x28', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 10, name: '', type: spill-slot, offset: -88, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d8', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d8', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 11, name: '', type: spill-slot, offset: -96, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d9', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d9', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 12, name: '', type: spill-slot, offset: -104, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d10', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d10', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 13, name: '', type: spill-slot, offset: -112, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d11', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 14, name: '', type: spill-slot, offset: -128, size: 8, alignment: 16,
-      stack-id: 0, callee-saved-register: '$d12', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d12', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     liveins: $x0, $x1, $d0, $d1, $d8, $d9, $d10, $d11, $d12, $x19, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
 
     early-clobber $sp = frame-setup STRDpre killed $d12, $sp, -128 :: (store 8 into %stack.14)
     frame-setup SEH_SaveFReg_X 12, -128

test/CodeGen/AArch64/wineh3.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x19', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x20', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x21', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x22', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x23', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x23', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x24', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x24', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x25', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x25', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x26', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x26', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x27', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x27', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 9, name: '', type: spill-slot, offset: -80, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x28', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 10, name: '', type: spill-slot, offset: -88, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d8', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d8', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 11, name: '', type: spill-slot, offset: -96, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d9', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d9', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 12, name: '', type: spill-slot, offset: -104, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d10', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d10', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 13, name: '', type: spill-slot, offset: -112, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d11', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     liveins: $x0, $x1, $d0, $d1, $d10, $d11, $d8, $d9, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
 
     early-clobber $sp = frame-setup STPDpre killed $d10, killed $d11, $sp, -14 :: (store 8 into %stack.12), (store 8 into %stack.13)
     frame-setup SEH_SaveFRegP_X 10, 11, -112

test/CodeGen/AArch64/wineh4.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x19', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x20', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x21', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x22', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x23', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x23', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x24', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x24', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x25', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x25', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x26', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x26', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x27', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x27', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 9, name: '', type: spill-slot, offset: -80, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x28', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 10, name: '', type: spill-slot, offset: -88, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d8', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d8', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 11, name: '', type: spill-slot, offset: -96, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d9', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d9', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 12, name: '', type: spill-slot, offset: -104, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d10', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d10', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 13, name: '', type: spill-slot, offset: -112, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d11', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.2(0x40000000), %bb.1(0x40000000)
     liveins: $x0, $x1, $d0, $d1, $d10, $d11, $d8, $d9, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
 
     early-clobber $sp = frame-setup STPDpre killed $d10, killed $d11, $sp, -14 :: (store 8 into %stack.12), (store 8 into %stack.13)

test/CodeGen/AArch64/wineh5.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  2993276
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: retval, type: default, offset: -36, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: i.addr, type: default, offset: -40, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -8, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: A, type: default, offset: -2992812, size: 2992772, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2992780, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, name: a, type: default, offset: -2992816, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2992784, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, name: B, type: default, offset: -2993308, size: 492, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2993276, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -2993320, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -2993324, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$fp', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$fp', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 9, name: '', type: spill-slot, offset: -32, size: 8, alignment: 16,
-      stack-id: 0, callee-saved-register: '$x28', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.1.entry:
     successors: %bb.2(0x40000000), %bb.3(0x40000000)
     liveins: $w0, $x28, $fp, $lr
 
     early-clobber $sp = frame-setup STRXpre killed $x28, $sp, -32 :: (store 8 into %stack.9)

test/CodeGen/AArch64/wineh6.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  24
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: default, offset: -20, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: '', type: default, offset: -24, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -8, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: '', type: default, offset: -28, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -12, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, name: '', type: default, offset: -32, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -16, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, name: '', type: default, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 5, name: '', type: variable-sized, offset: -40,
-      alignment: 1, stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      alignment: 1, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$fp', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$fp', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     liveins: $w0, $w1, $w2, $w3, $lr
 
     early-clobber $sp = frame-setup STPXpre killed $fp, killed $lr, $sp, -2 :: (store 8 into %stack.7), (store 8 into %stack.8)
     frame-setup SEH_SaveFPLR_X -16

test/CodeGen/AArch64/wineh7.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: variable-sized, offset: -48,
-      alignment: 1, stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      alignment: 1, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: 0, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$fp', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$fp', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x19', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 4, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x20', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x21', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x22', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     liveins: $w0, $w1, $w2, $w3, $x21, $x22, $x19, $x20, $lr
 
     early-clobber $sp = frame-setup STPXpre killed $x21, killed $x22, $sp, -6 :: (store 8 into %stack.5), (store 8 into %stack.6)
     frame-setup SEH_SaveRegP_X 21, 22, -48

test/CodeGen/AArch64/wineh8.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x19', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x20', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x21', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x22', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x23', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x23', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x24', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x24', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x25', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x25', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x26', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x26', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x27', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x27', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 9, name: '', type: spill-slot, offset: -80, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$x28', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 10, name: '', type: spill-slot, offset: -88, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d8', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d8', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 11, name: '', type: spill-slot, offset: -96, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d9', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d9', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 12, name: '', type: spill-slot, offset: -104, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d10', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d10', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 13, name: '', type: spill-slot, offset: -112, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d11', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.2(0x40000000), %bb.1(0x40000000)
     liveins: $x0, $x1, $d0, $d1, $d10, $d11, $d8, $d9, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
 
     early-clobber $sp = frame-setup STPDpre killed $d10, killed $d11, $sp, -14 :: (store 8 into %stack.12), (store 8 into %stack.13)

test/CodeGen/AArch64/wineh_shrinkwrap.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  4000
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: A, type: default, offset: 0, size: 4000, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4000, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.2(0x40000000), %bb.1(0x40000000)
     liveins: $w0, $w1
 

test/CodeGen/AMDGPU/memory-legalizer-multiple-mem-operands-nontemporal-1.mir

frameInfo:
   stackProtector:  ''
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
       isImmutable: false, isAliased: false, callee-saved-register: '' }
 stack:
   - { id: 0, name: scratch0, type: default, offset: 4, size: 32768, alignment: 4,
-      stack-id: 0, callee-saved-register: '', local-offset: 0,
+      stack-id: default, callee-saved-register: '', local-offset: 0,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: scratch1, type: default, offset: 32772, size: 32768,
-      alignment: 4, stack-id: 0, callee-saved-register: '', local-offset: 32768,
+      alignment: 4, stack-id: default, callee-saved-register: '', local-offset: 32768,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.1.if(0x30000000), %bb.2.else(0x50000000)
     liveins: $sgpr0_sgpr1, $sgpr3
 

test/CodeGen/AMDGPU/memory-legalizer-multiple-mem-operands-nontemporal-2.mir

frameInfo:
   stackProtector:  ''
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
       isImmutable: false, isAliased: false, callee-saved-register: '' }
 stack:
   - { id: 0, name: scratch0, type: default, offset: 4, size: 32768, alignment: 4,
-      stack-id: 0, callee-saved-register: '', local-offset: 0,
+      stack-id: default, callee-saved-register: '', local-offset: 0,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: scratch1, type: default, offset: 32772, size: 32768,
-      alignment: 4, stack-id: 0, callee-saved-register: '', local-offset: 32768,
+      alignment: 4, stack-id: default, callee-saved-register: '', local-offset: 32768,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.1.if(0x30000000), %bb.2.else(0x50000000)
     liveins: $sgpr0_sgpr1, $sgpr3
 

test/CodeGen/AMDGPU/sched-crash-dbg-value.mir

liveins:
   - { reg: '$vgpr0', virtual-reg: '%0' }
   - { reg: '$vgpr1', virtual-reg: '%1' }
   - { reg: '$vgpr2', virtual-reg: '%2' }
   - { reg: '$sgpr4_sgpr5', virtual-reg: '%3' }
   - { reg: '$sgpr6_sgpr7', virtual-reg: '%4' }
 fixedStack:
 stack:
   - { id: 0, name: tmp5, type: default, offset: 0, size: 128, alignment: 16,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: 0, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.bb:
     liveins: $vgpr0, $vgpr1, $vgpr2, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr4_sgpr5, $sgpr6_sgpr7, $sgpr32, $sgpr101
 
     %4:sgpr_64 = COPY $sgpr6_sgpr7

test/CodeGen/AMDGPU/sgpr-spill-wrong-stack-id.mir

--- |
   declare void @func(i32)
 
 ...
 ---
 
 # GCN-LABEL: name:            sgpr_spill_wrong_stack_id
 # SHARE: stack:
 # SHARE:   - { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# SHARE:       stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# SHARE:       stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # SHARE:       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # SHARE:   - { id: 1, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4,
-# SHARE:       stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+# SHARE:       stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
 # SHARE:       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # SHARE:   - { id: 2, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# SHARE:       stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+# SHARE:       stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
 # SHARE:       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 
 # SHARE: SI_SPILL_S32_SAVE $sgpr5, %stack.2, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (store 4 into %stack.2, addrspace 5)
 # SHARE: SI_SPILL_V32_SAVE killed $vgpr0, %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr5, 0, implicit $exec :: (store 4 into %stack.0, addrspace 5)
 # SHARE: SI_SPILL_S64_SAVE killed renamable $sgpr6_sgpr7, %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (store 8 into %stack.1, align 4, addrspace 5)
 # SHARE: renamable $sgpr6_sgpr7 = SI_SPILL_S64_RESTORE %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (load 8 from %stack.1, align 4, addrspace 5)
 # SHARE: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @func, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit undef $vgpr0
 # SHARE: $sgpr5 = SI_SPILL_S32_RESTORE %stack.2, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (load 4 from %stack.2, addrspace 5)
 # SHARE: $vgpr0 = SI_SPILL_V32_RESTORE %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr5, 0, implicit $exec :: (load 4 from %stack.0, addrspace 5)
 # SHARE: renamable $sgpr6_sgpr7 = SI_SPILL_S64_RESTORE %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (load 8 from %stack.1, align 4, addrspace 5)
 # SHARE: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @func, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit $vgpr0
 # SHARE:  $sgpr5 = SI_SPILL_S32_RESTORE %stack.2, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (load 4 from %stack.2, addrspace 5)
 
 # NOSHARE: stack:
 # NOSHARE: - { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# NOSHARE: stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# NOSHARE: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # NOSHARE: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # NOSHARE: - { id: 1, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4,
-# NOSHARE: stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+# NOSHARE: stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
 # NOSHARE: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # NOSHARE: - { id: 2, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# NOSHARE: stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+# NOSHARE: stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
 # NOSHARE: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # NOSHARE: - { id: 3, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# NOSHARE: stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+# NOSHARE: stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
 # NOSHARE: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 
 # NOSHARE: SI_SPILL_S32_SAVE $sgpr5, %stack.2, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (store 4 into %stack.2, addrspace 5)
 # NOSHARE: SI_SPILL_V32_SAVE killed $vgpr0, %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr5, 0, implicit $exec :: (store 4 into %stack.0, addrspace 5)
 # NOSHARE: SI_SPILL_S64_SAVE killed renamable $sgpr6_sgpr7, %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (store 8 into %stack.1, align 4, addrspace 5)
 # NOSHARE: renamable $sgpr6_sgpr7 = SI_SPILL_S64_RESTORE %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (load 8 from %stack.1, align 4, addrspace 5)
 # NOSHARE: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @func, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit undef $vgpr0
 # NOSHARE: $sgpr5 = SI_SPILL_S32_RESTORE %stack.2, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5 :: (load 4 from %stack.2, addrspace 5)

test/CodeGen/AMDGPU/stack-slot-color-sgpr-vgpr-spills.mir

 # RUN: llc -march=amdgcn -mcpu=fiji -verify-machineinstrs -stress-regalloc=1 -start-before=greedy -stop-after=stack-slot-coloring -o - %s | FileCheck  %s
 ---
 
 # CHECK-LABEL: name: no_merge_sgpr_vgpr_spill_slot{{$}}
 # CHECK: stack:
 # CHECK:   - { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# CHECK-NEXT: stack-id: 0,
+# CHECK-NEXT: stack-id: default,
 
 # CHECK: - { id: 1, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-# CHECK-NEXT: stack-id: 1,
+# CHECK-NEXT: stack-id: sgpr_spill,
 
 # CHECK: SI_SPILL_V32_SAVE killed $vgpr0, %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr5, 0, implicit $exec :: (store 4 into %stack.0, addrspace 5)
 # CHECK: $vgpr0 = SI_SPILL_V32_RESTORE %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr5, 0, implicit $exec :: (load 4 from %stack.0, addrspace 5)
 
 # CHECK: SI_SPILL_S32_SAVE killed renamable $sgpr6, %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5, implicit-def dead $m0 :: (store 4 into %stack.1, addrspace 5)
 # CHECK: $sgpr6 = SI_SPILL_S32_RESTORE %stack.1, implicit $exec, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr5, implicit-def dead $m0 :: (load 4 from %stack.1, addrspace 5)
 
 name: no_merge_sgpr_vgpr_spill_slot

test/CodeGen/AMDGPU/undefined-physreg-sgpr-spill.mir

 selected:        false
 tracksRegLiveness: true
 registers:
 liveins:
   - { reg: '$vgpr0', virtual-reg: '' }
   - { reg: '$sgpr4_sgpr5', virtual-reg: '' }
 stack:
   - { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4,
-      stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     successors: %bb.1, %bb.2
     liveins: $vgpr0, $sgpr4_sgpr5
 

 selected:        false
 tracksRegLiveness: true
 registers:
 liveins:
   - { reg: '$vgpr0', virtual-reg: '' }
   - { reg: '$sgpr4_sgpr5', virtual-reg: '' }
 stack:
   - { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4,
-      stack-id: 1, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: sgpr_spill, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     successors: %bb.1, %bb.2
     liveins: $vgpr0, $sgpr4_sgpr5
 

test/CodeGen/ARM/constant-island-movwt.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: false,
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$r11', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$r7', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$r6', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$r6', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 4, name: '', type: spill-slot, offset: -20, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$r5', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 5, name: '', type: spill-slot, offset: -24, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$r4', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 6, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d11', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 7, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d10', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d10', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 8, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d9', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d9', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 9, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d8', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d8', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
   - id:              0
     value:           'float 0.000000e+00'
     alignment:       4
     isTargetSpecific: false
 body:             |
   bb.0.entry:

test/CodeGen/ARM/fp16-litpool-arm.mir

 tracksRegLiveness: true
 liveins:
   - { reg: '$r0' }
 frameInfo:
   stackSize:       4
   maxAlignment:    2
   maxCallFrameSize: 0
 stack:
-  - { id: 0, name: S, offset: -2, size: 2, alignment: 2, stack-id: 0, local-offset: -2 }
+  - { id: 0, name: S, offset: -2, size: 2, alignment: 2, stack-id: default, local-offset: -2 }
 constants:
   - id:              0
     value:           i32 1576323506
     alignment:       4
   - id:              1
     value:           i32 987766
     alignment:       4
   - id:              2

test/CodeGen/ARM/fp16-litpool-thumb.mir

 name:            THUMB
 alignment:       1
 tracksRegLiveness: true
 frameInfo:
   stackSize:       8
   maxAlignment:    4
   maxCallFrameSize: 0
 stack:
-  - { id: 0, name: F, offset: -4, size: 4, alignment: 4, stack-id: 0, local-offset: -4 }
-  - { id: 1, name: S, offset: -6, size: 2, alignment: 2, stack-id: 0, local-offset: -6 }
+  - { id: 0, name: F, offset: -4, size: 4, alignment: 4, stack-id: default, local-offset: -4 }
+  - { id: 1, name: S, offset: -6, size: 2, alignment: 2, stack-id: default, local-offset: -6 }
 constants:
   - id:              0
     value:           i32 1109917696
     alignment:       4
   - id:              1
     value:           half 0xH2E66
     alignment:       2
 

test/CodeGen/ARM/fp16-litpool2-arm.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: res, type: default, offset: -2, size: 2, alignment: 2,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
   - id:              0
     value:           half 0xH706B
     alignment:       2
     isTargetSpecific: false
 

test/CodeGen/ARM/fp16-litpool3-arm.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: res, type: default, offset: -2, size: 2, alignment: 2,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -2, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
   - id:              0
     value:           half 0xH706B
     alignment:       2
     isTargetSpecific: false
 

test/CodeGen/ARM/register-scavenger-exceptions.mir

 # Check that the register scavenger does pick r5 (not preserved in prolog) for
 # materialising a stack frame address when the function ends in throwing an
 # exception.
 # CHECK: $sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r10, killed $r11, killed $lr
 # CHECK-NOT: $r5
 name:            _Z3foov
 stack:
   - { id: 0, name: V1, type: default, offset: 0, size: 5000, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4080, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: tmp3, type: variable-sized, offset: 0, alignment: 1,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4112, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 body:             |
   bb.0.entry:
 
     $r0 = MOVi 0, 14, $noreg, $noreg
     $r1 = MOVi 0, 14, $noreg, $noreg
     $r2 = MOVi 0, 14, $noreg, $noreg
     $r3 = MOVi 0, 14, $noreg, $noreg
     $r4 = MOVi 0, 14, $noreg, $noreg
     STRi12 killed $lr, %stack.2, 0, 14, $noreg :: (store 4 into %stack.2)
     BL @_Z3barv, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit killed $r2, implicit killed $r3, implicit killed $r4, implicit-def $sp
 
 ...

test/CodeGen/MIR/AArch64/mirCanonCopyCopyProp.mir

 # RUN: llc -mtriple=arm64-apple-ios11.0.0 -o - -run-pass mir-canonicalizer %s | FileCheck %s
 
 ...
 ---
 name: Proc8
 stack:
   - { id: 0, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -16, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -32, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -40, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 5, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -48, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 6, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -56, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body: |
   bb.0:
     liveins: $x0, $x1, $d0, $d1
 
     %42:gpr32 = LDRWui %stack.0, 0 :: (dereferenceable load 8)

test/CodeGen/MIR/AArch64/mirCanonIdempotent.mir

 # RUN: llc -mtriple=arm64-apple-ios11.0.0 -o - -run-pass mir-canonicalizer %s | FileCheck %s
 # These Idempotent instructions are sorted alphabetically (based on after the '=')
 # CHECK: %namedVReg4352:gpr64 = MOVi64imm 4617315517961601024
 # CHECK: %namedVReg4353:gpr32 = MOVi32imm 408
 # CHECK: %namedVReg4354:gpr32 = MOVi32imm 408
 # CHECK: %namedVReg4355:gpr64all = IMPLICIT_DEF
 # CHECK: %namedVReg4356:fpr64 = FMOVDi 20
 # CHECK: %namedVReg4357:fpr64 = FMOVDi 112
 ...
 ---
 name: Proc8
 stack:
   - { id: 0, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -16, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -32, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -40, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 5, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -48, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 6, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -56, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body: |
   bb.0:
     liveins: $x0, $x1, $d0, $d1
 
     %3:fpr64 = COPY $d1

test/CodeGen/MIR/AArch64/stack-object-local-offset.mir

registers:
   - { id: 1, class: gpr64 }
   - { id: 2, class: gpr64common }
   - { id: 3, class: gpr64common }
 frameInfo:
   maxAlignment:    8
 # CHECK-LABEL: stack_local
 # CHECK: stack:
 # CHECK: - { id: 0, name: local_var, type: default, offset: 0, size: 8, alignment: 8,
-# CHECK-NEXT: stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # CHECK-NEXT: local-offset: -8, debug-info-variable: '', debug-info-expression: '',
 # CHECK-NEXT: debug-info-location: '' }
 stack:
   - { id: 0,name: local_var,offset: 0,size: 8,alignment: 8, local-offset: -8 }
 body: |
   bb.0.entry:
     %0 = ADRP @var
     %1 = LDRXui killed %0, @var :: (load 8 from @var)
     STRXui killed %1, %stack.0.local_var, 0 :: (store 8 into %ir.local_var)
     %2 = ADRP @local_addr
     %3 = ADDXri %stack.0.local_var, 0, 0
     STRXui killed %3, killed %2, @local_addr :: (store 8 into @local_addr)
     RET_ReallyLR
 ...

test/CodeGen/MIR/AMDGPU/stack-id.mir

 # RUN: llc -march=amdgcn -run-pass none -o - %s | FileCheck %s
 ...
 ---
 
 # CHECK-LABEL: name: spill_slot_stack_id
 # CHECK: {{^}}fixedStack:
-# CHECK: - { id: 0, type: spill-slot, offset: 0, size: 4, alignment: 4, stack-id: 0,
-# CHECK: - { id: 1, type: spill-slot, offset: 0, size: 8, alignment: 4, stack-id: 0,
-# CHECK: - { id: 2, type: spill-slot, offset: 0, size: 16, alignment: 4, stack-id: 9,
+# CHECK: - { id: 0, type: spill-slot, offset: 0, size: 4, alignment: 4, stack-id: default,
+# CHECK: - { id: 1, type: spill-slot, offset: 0, size: 8, alignment: 4, stack-id: default,
+# CHECK: - { id: 2, type: spill-slot, offset: 0, size: 16, alignment: 4, stack-id: noalloc,
 
 # CHECK: {{^}}stack:
 # CHECK: - { id: 0, name: '', type: spill-slot, offset: 0, size: 16,
-# CHECK-NEXT: stack-id: 3,
+# CHECK-NEXT: stack-id: noalloc,
 
 # CHECK: - { id: 1, name: '', type: spill-slot, offset: 0, size: 8,
-# CHECK-NEXT: stack-id: 0,
+# CHECK-NEXT: stack-id: default,
 
 # CHECK: - { id: 2, name: '', type: spill-slot, offset: 0, size: 4,
-# CHECK-NEXT: stack-id: 0,
+# CHECK-NEXT: stack-id: default,
 
 
 name: spill_slot_stack_id
 fixedStack:
-  - { id: 0, type: spill-slot, offset: 0, size: 16, alignment: 4, stack-id: 9 }
-  - { id: 1, type: spill-slot, offset: 0, size: 8, alignment: 4, stack-id: 0 }
+  - { id: 0, type: spill-slot, offset: 0, size: 16, alignment: 4, stack-id: noalloc }
+  - { id: 1, type: spill-slot, offset: 0, size: 8, alignment: 4, stack-id: default }
   - { id: 2, type: spill-slot, offset: 0, size: 4, alignment: 4 }
 stack:
-  - { id: 0, name: '', type: spill-slot, offset: 0, size: 16, alignment: 4, stack-id: 3 }
-  - { id: 1, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4, stack-id: 0 }
+  - { id: 0, name: '', type: spill-slot, offset: 0, size: 16, alignment: 4, stack-id: noalloc }
+  - { id: 1, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4, stack-id: default }
   - { id: 2, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4 }
 
 body: |
   bb.0:
     S_ENDPGM 0
 ...

test/CodeGen/MIR/X86/branch-folder-with-label.mir

frameInfo:
   cvBytesOfCalleeSavedRegisters: 8
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
 stack:           
 constants:       
 body:             |
   bb.0.entry:
     successors: %bb.1(0x30000000), %bb.2(0x50000000)
     liveins: $rdi, $rbx
frameInfo:
   cvBytesOfCalleeSavedRegisters: 16
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
 stack:           
   - { id: 0, name: idx, type: default, offset: -28, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       
 body:             |
   bb.0.entry:
     successors: %bb.1(0x30000000), %bb.2(0x50000000)
     liveins: $rdi, $r14, $rbx
   
     frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp

test/CodeGen/MIR/X86/diexpr-win32.mir

frameInfo:
   stackProtector:  ''
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$esi' }
-  - { id: 1, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 1, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '' }
-  - { id: 2, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0,
+  - { id: 2, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '' }
 stack:
 constants:
 body:             |
   bb.0.entry:
     liveins: $esi
 
     frame-setup PUSH32r killed $esi, implicit-def $esp, implicit $esp
frameInfo:
   stackProtector:  ''
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '' }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '' }
 stack:
 constants:
 body:             |
   bb.0.entry:
     $eax = MOV32rm $esp, 1, _, 4, _ :: (load 4 from %fixed-stack.1)
     $eax = MOV32rm killed $eax, 1, _, 0, _, debug-location !34 :: (load 4 from %ir.0)
     DBG_VALUE $eax, 0, !35, !DIExpression(DW_OP_constu, 4, DW_OP_minus), debug-location !34
     $eax = ADD32rm killed $eax, $esp, 1, _, 8, _, implicit-def dead $eflags, debug-location !36 :: (load 4 from %fixed-stack.0)
     RET 0, $eax, debug-location !36
 
 ...

test/CodeGen/MIR/X86/fixed-stack-di.mir

 ...
 ---
 name:            foo
 alignment:       4
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    8
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, debug-info-variable: '!3', debug-info-expression: '!DIExpression()',
+  - { id: 0, size: 4, alignment: 16, stack-id: default, debug-info-variable: '!3', debug-info-expression: '!DIExpression()',
       debug-info-location: '!5' }
 body:             |
   bb.0.entry:
 
 ...

test/CodeGen/MIR/X86/fixed-stack-objects.mir

 
 ...
 ---
 name:            test
 frameInfo:
   stackSize:       4
   maxAlignment:    4
 # CHECK: fixedStack:
-# CHECK-NEXT: - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0
+# CHECK-NEXT: - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: default
 # CHECK-NEXT: isImmutable: true,
 fixedStack:
   - { id: 0, offset: 0, size: 4, alignment: 4, isImmutable: true, isAliased: false }
 stack:
   - { id: 0, offset: -8, size: 4, alignment: 4 }
 body: |
   bb.0.entry:
     $eax = MOV32rm $esp, 1, _, 8, _
     MOV32mr $esp, 1, _, 0, _, $eax
     RETL $eax
 ...

test/CodeGen/MIR/X86/spill-slot-fixed-stack-objects.mir

--- |
   attributes #0 = { "no-frame-pointer-elim"="false" }
 
 ...
 ---
 name:            test
 frameInfo:
   maxAlignment:    4
 # CHECK: fixedStack:
-# CHECK-NEXT: - { id: 0, type: spill-slot, offset: 0, size: 4, alignment: 4, stack-id: 0,
+# CHECK-NEXT: - { id: 0, type: spill-slot, offset: 0, size: 4, alignment: 4, stack-id: default,
 # CHECK-NEXT: callee-saved-register: '', callee-saved-restored: true, debug-info-variable: '',
 # CHECK-NEXT: debug-info-expression: '', debug-info-location: '' }
 fixedStack:
   - { id: 0, type: spill-slot, offset: 0, size: 4, alignment: 4 }
 stack:
   - { id: 0, offset: -12, size: 4, alignment: 4 }
 body: |
   bb.0.entry:
     MOV32mr $rsp, 1, _, -4, _, $edi
     $eax = COPY $edi
     RETQ $eax
 ...

test/CodeGen/MIR/X86/stack-objects.mir

 
 ...
 ---
 name:            test
 frameInfo:
   maxAlignment:    8
 # CHECK: stack:
 # CHECK-NEXT: - { id: 0, name: b, type: default, offset: -12, size: 4, alignment: 4,
-# CHECK-NEXT: stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # CHECK-NEXT: - { id: 1, name: x, type: default, offset: -24, size: 8, alignment: 8,
-# CHECK-NEXT: stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # CHECK-NEXT: - { id: 2, name: '', type: spill-slot, offset: -32, size: 4, alignment: 4,
-# CHECK-NEXT: stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
   - { id: 0, name: b, offset: -12, size: 4, alignment: 4 }
   - { id: 1, name: x, offset: -24, size: 8, alignment: 8 }
   - { id: 2, type: spill-slot, offset: -32, size: 4, alignment: 4 }
 body: |
   bb.0.entry:
     MOV32mr $rsp, 1, _, -4, _, $edi
     MOV64mi32 $rsp, 1, _, -16, _, 2
     $eax = MOV32rm $rsp, 1, _, -4, _
     RETQ $eax
 ...

test/CodeGen/MIR/X86/variable-sized-stack-objects.mir

 name:            test
 frameInfo:
   stackSize:       24
   offsetAdjustment: -16
   maxAlignment:    8
   adjustsStack:    true
 # CHECK: stack:
 # CHECK-NEXT: - { id: 0, name: '', type: default, offset: -20, size: 4, alignment: 4,
-# CHECK-NEXT:  stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# CHECK-NEXT:  stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # CHECK-NEXT: - { id: 1, name: '', type: default, offset: -32, size: 8, alignment: 8,
-# CHECK-NEXT:  stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+# CHECK-NEXT:  stack-id: default, callee-saved-register: '', callee-saved-restored: true,
 # CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 # CHECK-NEXT: - { id: 2, name: y, type: variable-sized, offset: -32, alignment: 1,
 stack:
   - { id: 0, offset: -20, size: 4, alignment: 4 }
   - { id: 1, offset: -32, size: 8, alignment: 8 }
   - { id: 2, name: y, type: variable-sized, offset: -32, alignment: 1 }
 body: |
   bb.0.entry:
     MOV32mr $rsp, 1, _, -4, _, $edi
     MOV64mi32 $rsp, 1, _, -16, _, 2
     $eax = MOV32rm $rsp, 1, _, -4, _
     RETQ $eax
 ...

test/CodeGen/Mips/GlobalISel/instruction-select/pointers.mir

 ...
 ---
 name:            ptr_arg_on_stack
 alignment:       2
 legalized:       true
 regBankSelected: true
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: ptr_arg_on_stack
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[ADDiu:%[0-9]+]]:gpr32 = ADDiu %fixed-stack.0, 0
     ; MIPS32: [[LW:%[0-9]+]]:gpr32 = LW [[ADDiu]], 0 :: (load 4 from %fixed-stack.0, align 8)

test/CodeGen/Mips/GlobalISel/instruction-select/stack_args.mir

 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
 # RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
 --- |
 
   declare i32 @f(i32, i32, i32, i32, i32)
   define void @g(i32, i32, i32, i32, i32) {entry: ret void}
 
 ...
 ---
 name:            g
 alignment:       2
 legalized:       true
 regBankSelected: true
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: g
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:gpr32 = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:gpr32 = COPY $a1

test/CodeGen/Mips/GlobalISel/legalizer/add.mir

bb.1.entry:
     RetRA implicit $v0, implicit $v1
 
 ...
 ---
 name:            add_i128
 alignment:       2
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 28, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
-  - { id: 1, offset: 24, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
-  - { id: 2, offset: 20, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
-  - { id: 3, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 28, size: 4, alignment: 4, stack-id: default, isImmutable: true }
+  - { id: 1, offset: 24, size: 4, alignment: 8, stack-id: default, isImmutable: true }
+  - { id: 2, offset: 20, size: 4, alignment: 4, stack-id: default, isImmutable: true }
+  - { id: 3, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: add_i128
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:_(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:_(s32) = COPY $a1

test/CodeGen/Mips/GlobalISel/legalizer/mul.mir

bb.1.entry:
     RetRA implicit $v0, implicit $v1
 
 ...
 ---
 name:            mul_i128
 alignment:       2
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 28, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
-  - { id: 1, offset: 24, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
-  - { id: 2, offset: 20, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
-  - { id: 3, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 28, size: 4, alignment: 4, stack-id: default, isImmutable: true }
+  - { id: 1, offset: 24, size: 4, alignment: 8, stack-id: default, isImmutable: true }
+  - { id: 2, offset: 20, size: 4, alignment: 4, stack-id: default, isImmutable: true }
+  - { id: 3, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: mul_i128
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:_(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:_(s32) = COPY $a1

test/CodeGen/Mips/GlobalISel/legalizer/pointers.mir

bb.1.entry:
     RetRA implicit $v0
 
 ...
 ---
 name:            ptr_arg_on_stack
 alignment:       2
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: ptr_arg_on_stack
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:_(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:_(s32) = COPY $a1

test/CodeGen/Mips/GlobalISel/legalizer/stack_args.mir

 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
 # RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=legalizer -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
 --- |
 
   declare i32 @f(i32, i32, i32, i32, i32)
   define void @g(i32, i32, i32, i32, i32) {entry: ret void}
 
 ...
 ---
 name:            g
 alignment:       2
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: g
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:_(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:_(s32) = COPY $a1

test/CodeGen/Mips/GlobalISel/legalizer/sub.mir

bb.1.entry:
     RetRA implicit $v0, implicit $v1
 
 ...
 ---
 name:            sub_i128
 alignment:       2
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 28, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
-  - { id: 1, offset: 24, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
-  - { id: 2, offset: 20, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
-  - { id: 3, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 28, size: 4, alignment: 4, stack-id: default, isImmutable: true }
+  - { id: 1, offset: 24, size: 4, alignment: 8, stack-id: default, isImmutable: true }
+  - { id: 2, offset: 20, size: 4, alignment: 4, stack-id: default, isImmutable: true }
+  - { id: 3, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: sub_i128
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:_(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:_(s32) = COPY $a1

test/CodeGen/Mips/GlobalISel/regbankselect/pointers.mir

 
 ...
 ---
 name:            ptr_arg_on_stack
 alignment:       2
 legalized:       true
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: ptr_arg_on_stack
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:gprb(s32) = COPY $a1

test/CodeGen/Mips/GlobalISel/regbankselect/stack_args.mir

 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
 # RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=regbankselect -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
 --- |
 
   declare i32 @f(i32, i32, i32, i32, i32)
   define void @g(i32, i32, i32, i32, i32) {entry: ret void}
 
 ...
 ---
 name:            g
 alignment:       2
 legalized:       true
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, offset: 16, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
  bb.1.entry:
     liveins: $a0, $a1, $a2, $a3
 
     ; MIPS32-LABEL: name: g
     ; MIPS32: liveins: $a0, $a1, $a2, $a3
     ; MIPS32: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
     ; MIPS32: [[COPY1:%[0-9]+]]:gprb(s32) = COPY $a1

test/CodeGen/Mips/micromips-eva.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: z.addr, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.1(0x80000000)
     liveins: $a0
 

test/CodeGen/Mips/micromips-short-delay-slot.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     liveins: $ra
 
     $sp = ADDiu $sp, -24

test/CodeGen/Mips/micromips-sizereduction/micromips-lwp-swp.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s1', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s1', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a0, $a1, $ra, $s1, $s0
 
     $sp = ADDiu $sp, -32
     CFI_INSTRUCTION def_cfa_offset 32
frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s1', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s1', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a0, $a1, $ra, $s1, $s0
 
     $sp = ADDiu $sp, -32
     CFI_INSTRUCTION def_cfa_offset 32
frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s1', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s1', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a0, $a1, $ra, $s1, $s0
 
     $sp = ADDiu $sp, -32
     CFI_INSTRUCTION def_cfa_offset 32
frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s1', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s1', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a0, $a1, $ra, $s1, $s0
 
     $sp = ADDiu $sp, -32
     CFI_INSTRUCTION def_cfa_offset 32

test/CodeGen/Mips/micromips-sizereduction/micromips-movep.mir

--- |
   declare i64 @f(i64 signext)
   declare i64 @g()
 
 ...
 ---
 name:            move1
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $ra
 
     ; CHECK-LABEL: name: move1
     ; CHECK: ADDIUSP_MM -24
bb.0:
     $sp = ADDiu $sp, 24
     PseudoReturn undef $ra, implicit $v0, implicit $v1
 
 ...
 ---
 name:            move2
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $ra
 
     ; CHECK-LABEL: name: move2
     ; CHECK: ADDIUSP_MM -24

test/CodeGen/Mips/micromips-sizereduction/micromips-no-lwp-swp.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a1, $ra, $s0
 
     $sp = ADDiu $sp, -24
     CFI_INSTRUCTION def_cfa_offset 24
frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a1, $ra, $s0
 
     $sp = ADDiu $sp, -24
     CFI_INSTRUCTION def_cfa_offset 24
frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a1, $ra, $s0
 
     $sp = ADDiu $sp, -24
     CFI_INSTRUCTION def_cfa_offset 24
frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0:
     liveins: $a1, $ra, $s0
 
     $sp = ADDiu $sp, -24
     CFI_INSTRUCTION def_cfa_offset 24

test/CodeGen/PowerPC/NoCRFieldRedefWhenSpillingCRBIT.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      []
 stack:           
   - { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       []
 body:             |
   bb.0.entry:
     liveins: $x3, $x4, $x5
   
     renamable $cr0 = CMPW renamable $r3, renamable $r4, implicit $x4
     renamable $cr1 = CMPW renamable $r3, renamable $r5, implicit $x5, implicit killed $x3

test/CodeGen/PowerPC/convert-rr-to-ri-instrs.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
 stack:           
   - { id: 0, name: '', type: default, offset: 0, size: 16, alignment: 16, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -16, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: '', type: default, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -20, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: '', type: default, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -24, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 3, name: '', type: default, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -28, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 4, name: '', type: default, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -32, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:       
 body:             |
   bb.0.entry:
     liveins: $x3, $x4
   
     %1 = COPY $x4

test/CodeGen/PowerPC/setcr_bc.mir

frameInfo:
   maxCallFrameSize: 32
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$x30', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
 stack:           
 constants:       
 
 body:             |
   bb.0.entry:
     successors: %bb.2(0x30000000), %bb.1(0x50000000)

test/CodeGen/PowerPC/setcr_bc2.mir

frameInfo:
   maxCallFrameSize: 32
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$x30', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
 stack:           
 constants:       
 
 body:             |
   bb.0.entry:
     successors: %bb.2(0x30000000), %bb.1(0x50000000)

test/CodeGen/PowerPC/setcr_bc3.mir

frameInfo:
   maxCallFrameSize: 32
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$x30', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 
 body:             |
   bb.0:
     successors: %bb.2(0x30000000), %bb.1(0x50000000)

test/CodeGen/SystemZ/debuginstr-02.mir

liveins:
   - { reg: '$r2l', virtual-reg: '%0' }
   - { reg: '$f0s', virtual-reg: '%1' }
   - { reg: '$f2s', virtual-reg: '%2' }
   - { reg: '$f4s', virtual-reg: '%3' }
   - { reg: '$f6s', virtual-reg: '%4' }
 frameInfo:       
   maxAlignment:    8
 fixedStack:      
-  - { id: 0, size: 4, alignment: 8, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 8, stack-id: default, isImmutable: true }
 body:             |
   bb.0 (%ir-block.0):
     liveins: $r2l, $f0s, $f2s, $f4s, $f6s
   
     %4:fp32bit = COPY $f6s
     %3:fp32bit = COPY $f4s
     %2:fp32bit = COPY $f2s
     %1:fp32bit = COPY $f0s

test/CodeGen/SystemZ/subregliveness-06.mir

 alignment:       4
 tracksRegLiveness: true
 liveins:         
   - { reg: '$r2d', virtual-reg: '%10' }
   - { reg: '$r3d', virtual-reg: '%11' }
 frameInfo:       
   maxAlignment:    8
 stack:           
-  - { id: 0, name: tmp, size: 4, alignment: 4, stack-id: 0 }
-  - { id: 1, name: tmp2, size: 200, alignment: 8, stack-id: 0 }
+  - { id: 0, name: tmp, size: 4, alignment: 4, stack-id: default }
+  - { id: 1, name: tmp2, size: 200, alignment: 8, stack-id: default }
 body:             |
   bb.0.bb:
     liveins: $r2d, $r3d
   
     %11:gr64bit = COPY killed $r3d
     %10:gr64bit = COPY killed $r2d
     %13:grx32bit = COPY killed %11.subreg_l32
     %12:grx32bit = COPY killed %10.subreg_l32

test/CodeGen/Thumb/PR36658.mir

liveins:
   - { reg: '$r0' }
 frameInfo:
   stackSize:       8
   maxAlignment:    4
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 stack:
-  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$lr', callee-saved-restored: false }
-  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: 0,
+  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$r4' }
 jumpTable:
   kind:            inline
   entries:
     - id:              0
       blocks:          [ '%bb.28', '%bb.26', '%bb.26', '%bb.26', '%bb.26',
                          '%bb.24', '%bb.23', '%bb.26', '%bb.26', '%bb.12',
                          '%bb.22' ]

test/CodeGen/Thumb2/high-reg-spill.mir

 ...
 ---
 name:            constraint_h
 tracksRegLiveness: true
 registers:
   - { id: 0, class: hgpr }
   - { id: 1, class: tgpr }
 stack:
-  - { id: 0, name: i, size: 4, alignment: 4, stack-id: 0, local-offset: -4 }
+  - { id: 0, name: i, size: 4, alignment: 4, stack-id: default, local-offset: -4 }
 body:             |
   bb.0.entry:
     %1:tgpr = tLDRspi %stack.0.i, 0, 14, $noreg :: (dereferenceable load 4 from %ir.i)
     %0:hgpr = COPY %1
     INLINEASM &"@ $0", 1, 589833, %0, 12, implicit-def early-clobber $r12
     tBX_RET 14, $noreg
 
 ...
 # CHECK: bb.0.entry:
 # CHECK-NEXT: renamable $r0 = tLDRspi %stack.0.i, 0, 14, $noreg :: (dereferenceable load 4 from %ir.i)
 # CHECK-NEXT: renamable $r12 = COPY killed renamable $r0
 # CHECK-NEXT: t2STRi12 killed $r12, %stack.1, 0, 14, $noreg :: (store 4 into %stack.1)
 # CHECK-NEXT: $r8 = t2LDRi12 %stack.1, 0, 14, $noreg :: (load 4 from %stack.1)
 # CHECK-NEXT: INLINEASM &"@ $0", 1, 589833, killed renamable $r8, 12, implicit-def early-clobber $r12
 # CHECK-NEXT: tBX_RET 14, $noreg

test/CodeGen/Thumb2/peephole-cmp.mir

 # RUN: llc -run-pass=peephole-opt -verify-machineinstrs -o - %s | FileCheck %s
 --- |
   target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
   target triple = "thumbv7m-none-none-eabi"
 
   define i32 @test_addir_frameindex(i32 %a) {
     %f = alloca i32
     ret i32 %a
   }
 ...
 ---
 name:            test_addir_frameindex
 liveins:
   - { reg: '$r0', virtual-reg: '%0' }
 stack:
   - { id: 0, name: f, type: default, offset: 0, size: 1, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       local-offset: -4, debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 body:             |
   bb.0:
     successors: %bb.2(0x40000000), %bb.1(0x40000000)
     liveins: $r0
 
     %0:rgpr = COPY $r0

test/CodeGen/X86/GlobalISel/x32-select-frameIndex.mir

 legalized:       true
 regBankSelected: true
 selected:        false
 registers:
   - { id: 0, class: gpr, preferred-register: '' }
 fixedStack:
 stack:
   - { id: 0, name: ptr1, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: allocai32
     ; CHECK: [[LEA64_32r:%[0-9]+]]:gr32 = LEA64_32r %stack.0.ptr1, 1, $noreg, 0, $noreg
     ; CHECK: $eax = COPY [[LEA64_32r]]
     ; CHECK: RET 0, implicit $eax
     %0:gpr(p0) = G_FRAME_INDEX %stack.0.ptr1
     $eax = COPY %0(p0)
     RET 0, implicit $eax
 
 ...

test/CodeGen/X86/GlobalISel/x86-legalize-inttoptr.mir

 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: inttoptr_p0_s32
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
     ; CHECK: [[LOAD:%[0-9]+]]:_(s32) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[INTTOPTR:%[0-9]+]]:_(p0) = G_INTTOPTR [[LOAD]](s32)
     ; CHECK: $eax = COPY [[INTTOPTR]](p0)
     ; CHECK: RET 0, implicit $eax
     %1:_(p0) = G_FRAME_INDEX %fixed-stack.0
     %0:_(s32) = G_LOAD %1(p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     %2:_(p0) = G_INTTOPTR %0(s32)
     $eax = COPY %2(p0)
     RET 0, implicit $eax
 
 ...

test/CodeGen/X86/GlobalISel/x86-legalize-ptrtoint.mir

 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }
   - { id: 3, class: _ }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s1_p0
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
     ; CHECK: [[LOAD:%[0-9]+]]:_(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[PTRTOINT:%[0-9]+]]:_(s1) = G_PTRTOINT [[LOAD]](p0)
     ; CHECK: [[ANYEXT:%[0-9]+]]:_(s8) = G_ANYEXT [[PTRTOINT]](s1)
     ; CHECK: $al = COPY [[ANYEXT]](s8)

 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s8_p0
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
     ; CHECK: [[LOAD:%[0-9]+]]:_(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[PTRTOINT:%[0-9]+]]:_(s8) = G_PTRTOINT [[LOAD]](p0)
     ; CHECK: $al = COPY [[PTRTOINT]](s8)
     ; CHECK: RET 0, implicit $al

 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s16_p0
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
     ; CHECK: [[LOAD:%[0-9]+]]:_(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[PTRTOINT:%[0-9]+]]:_(s16) = G_PTRTOINT [[LOAD]](p0)
     ; CHECK: $ax = COPY [[PTRTOINT]](s16)
     ; CHECK: RET 0, implicit $ax

 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s32_p0
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
     ; CHECK: [[LOAD:%[0-9]+]]:_(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[PTRTOINT:%[0-9]+]]:_(s32) = G_PTRTOINT [[LOAD]](p0)
     ; CHECK: $eax = COPY [[PTRTOINT]](s32)
     ; CHECK: RET 0, implicit $eax
     %1:_(p0) = G_FRAME_INDEX %fixed-stack.0
     %0:_(p0) = G_LOAD %1(p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     %2:_(s32) = G_PTRTOINT %0(p0)
     $eax = COPY %2(s32)
     RET 0, implicit $eax
 
 ...

test/CodeGen/X86/GlobalISel/x86-legalize-srem.mir

frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_srem_i8
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_srem_i16
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_srem_i32
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0

test/CodeGen/X86/GlobalISel/x86-legalize-urem.mir

frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_urem_i8
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_urem_i16
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_urem_i32
     ; CHECK: [[FRAME_INDEX:%[0-9]+]]:_(p0) = G_FRAME_INDEX %fixed-stack.0

test/CodeGen/X86/GlobalISel/x86-select-frameIndex.mir

 legalized:       true
 regBankSelected: true
 selected:        false
 registers:
   - { id: 0, class: gpr, preferred-register: '' }
 fixedStack:
 stack:
   - { id: 0, name: ptr1, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: allocai32
     ; CHECK: [[LEA32r:%[0-9]+]]:gr32 = LEA32r %stack.0.ptr1, 1, $noreg, 0, $noreg
     ; CHECK: $eax = COPY [[LEA32r]]
     ; CHECK: RET 0, implicit $eax
     %0:gpr(p0) = G_FRAME_INDEX %stack.0.ptr1
     $eax = COPY %0(p0)
     RET 0, implicit $eax
 
 ...

test/CodeGen/X86/GlobalISel/x86-select-inttoptr.mir

 tracksRegLiveness: true
 registers:
   - { id: 0, class: gpr }
   - { id: 1, class: gpr }
   - { id: 2, class: gpr }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: inttoptr_p0_s32
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: $eax = COPY [[MOV32rm]]
     ; CHECK: RET 0, implicit $eax
     %1:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
     %0:gpr(s32) = G_LOAD %1(p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     %2:gpr(p0) = G_INTTOPTR %0(s32)
     $eax = COPY %2(p0)
     RET 0, implicit $eax
 
 ...

test/CodeGen/X86/GlobalISel/x86-select-ptrtoint.mir

 registers:
   - { id: 0, class: gpr }
   - { id: 1, class: gpr }
   - { id: 2, class: gpr }
   - { id: 3, class: gpr }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s1_p0
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32_abcd = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[COPY:%[0-9]+]]:gr8 = COPY [[MOV32rm]].sub_8bit
     ; CHECK: $al = COPY [[COPY]]
     ; CHECK: RET 0, implicit $al
     %1:gpr(p0) = G_FRAME_INDEX %fixed-stack.0

 tracksRegLiveness: true
 registers:
   - { id: 0, class: gpr }
   - { id: 1, class: gpr }
   - { id: 2, class: gpr }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s8_p0
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32_abcd = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[COPY:%[0-9]+]]:gr8 = COPY [[MOV32rm]].sub_8bit
     ; CHECK: $al = COPY [[COPY]]
     ; CHECK: RET 0, implicit $al
     %1:gpr(p0) = G_FRAME_INDEX %fixed-stack.0

 tracksRegLiveness: true
 registers:
   - { id: 0, class: gpr }
   - { id: 1, class: gpr }
   - { id: 2, class: gpr }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s16_p0
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: [[COPY:%[0-9]+]]:gr16 = COPY [[MOV32rm]].sub_16bit
     ; CHECK: $ax = COPY [[COPY]]
     ; CHECK: RET 0, implicit $ax
     %1:gpr(p0) = G_FRAME_INDEX %fixed-stack.0

 tracksRegLiveness: true
 registers:
   - { id: 0, class: gpr }
   - { id: 1, class: gpr }
   - { id: 2, class: gpr }
 frameInfo:
   maxAlignment:    4
 fixedStack:
-  - { id: 0, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 body:             |
   bb.1.entry:
     ; CHECK-LABEL: name: ptrtoint_s32_p0
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)
     ; CHECK: $eax = COPY [[MOV32rm]]
     ; CHECK: RET 0, implicit $eax
     %1:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
     %0:gpr(p0) = G_LOAD %1(p0) :: (invariant load 4 from %fixed-stack.0, align 16)
     %2:gpr(s32) = G_PTRTOINT %0(p0)
     $eax = COPY %2(s32)
     RET 0, implicit $eax
 
 ...

test/CodeGen/X86/GlobalISel/x86-select-srem.mir

frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_srem_i8
     ; CHECK: [[MOV8rm:%[0-9]+]]:gr8 = MOV8rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 1 from %fixed-stack.0, align 16)
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_srem_i16
     ; CHECK: [[MOV16rm:%[0-9]+]]:gr16 = MOV16rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 2 from %fixed-stack.0, align 16)
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_srem_i32
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)

test/CodeGen/X86/GlobalISel/x86-select-udiv.mir

frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_udiv_i8
     ; CHECK: [[MOV8rm:%[0-9]+]]:gr8 = MOV8rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 1 from %fixed-stack.0, align 16)
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_udiv_i16
     ; CHECK: [[MOV16rm:%[0-9]+]]:gr16 = MOV16rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 2 from %fixed-stack.0, align 16)
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_udiv_i32
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0)

test/CodeGen/X86/GlobalISel/x86-select-urem.mir

frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 1, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 1, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_urem_i8
     ; CHECK: [[MOV8rm:%[0-9]+]]:gr8 = MOV8rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 1 from %fixed-stack.0, align 16)
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 2, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 2, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_urem_i16
     ; CHECK: [[MOV16rm:%[0-9]+]]:gr16 = MOV16rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 2 from %fixed-stack.0, align 16)
frameInfo:
   maxCallFrameSize: 4294967295
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 stack:
 constants:
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: test_urem_i32
     ; CHECK: [[MOV32rm:%[0-9]+]]:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (invariant load 4 from %fixed-stack.0, align 16)

test/CodeGen/X86/GlobalISel/x86_64-select-frameIndex.mir

 legalized:       true
 regBankSelected: true
 selected:        false
 registers:
   - { id: 0, class: gpr, preferred-register: '' }
 fixedStack:
 stack:
   - { id: 0, name: ptr1, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 
 body:             |
   bb.1 (%ir-block.0):
     ; CHECK-LABEL: name: allocai32
     ; CHECK: [[LEA64r:%[0-9]+]]:gr64 = LEA64r %stack.0.ptr1, 1, $noreg, 0, $noreg
     ; CHECK: $rax = COPY [[LEA64r]]
     ; CHECK: RET 0, implicit $rax
     %0:gpr(p0) = G_FRAME_INDEX %stack.0.ptr1
     $rax = COPY %0(p0)
     RET 0, implicit $rax
 
 ...

test/CodeGen/X86/PR37310.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
 stack:           
   - { id: 0, name: q, type: default, offset: 0, size: 512, alignment: 16, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: r, type: default, offset: 0, size: 512, alignment: 16, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       
 body:             |
   bb.0.entry:
     successors: %bb.3(0x40000000), %bb.1(0x40000000)
     liveins: $edi
   
     %0:gr32 = COPY $edi

test/CodeGen/X86/avoid-sfb-offset.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
 stack:           
   - { id: 0, name: a, type: default, offset: 0, size: 144, alignment: 16, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: z, type: default, offset: 0, size: 144, alignment: 16, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       
 body:             |
   bb.0.entry:
     %0:gr32 = MOV32rm %stack.0.a, 1, $noreg, 36, $noreg :: (dereferenceable load 4 from %ir.arrayidx.9)
     %1:gr32 = ADD32ri8 %0, 9, implicit-def dead $eflags
     MOV32mr %stack.0.a, 1, $noreg, 36, $noreg, killed %1 :: (store 4 into %ir.arrayidx.9)
     %2:vr256 = VMOVUPSYrm %stack.0.a, 1, $noreg, 4, $noreg :: (dereferenceable load 32 from %ir.scevgep40, align 4)

test/CodeGen/X86/movtopush.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: p, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: q, type: default, offset: 0, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: s, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     ADJCALLSTACKDOWN32 16, 0, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp
     %0 = COPY $esp
     MOV32mi %0, 1, $noreg, 12, $noreg, 4 :: (store 4 into stack + 12)

test/CodeGen/X86/pr30821.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: alpha, type: default, offset: 0, size: 1, alignment: 1,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: foxtrot, type: default, offset: 0, size: 16, alignment: 16,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: india, type: default, offset: 0, size: 16, alignment: 16,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     ; To trick stack-slot-colouring to run its dead-store-elimination phase,
     ; which is at fault, we need the register allocator to run, and spill in two
     ; places that can have their slots merged. Achieve this by volatile-loading

test/CodeGen/X86/regalloc-copy-hints.mir

registers:
   - { id: 79, class: gr32 }
   - { id: 80, class: gr32 }
   - { id: 81, class: gr32_abcd }
   - { id: 82, class: gr32 }
 frameInfo:       
   maxAlignment:    4
   hasCalls:        true
 fixedStack:      
-  - { id: 0, size: 4, alignment: 4, stack-id: 0, isImmutable: true }
+  - { id: 0, size: 4, alignment: 4, stack-id: default, isImmutable: true }
 body:             |
   bb.0:
     successors: %bb.1(0x00000001), %bb.2(0x7fffffff)
   
     %13:gr32_abcd = MOV32r0 implicit-def dead $eflags
     TEST8rr %13.sub_8bit, %13.sub_8bit, implicit-def $eflags
     JNE_1 %bb.2, implicit killed $eflags
     JMP_1 %bb.1

test/CodeGen/X86/shrink_wrap_dbg_value.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   # CHECK: savePoint:       '%bb.1'
   # CHECK: restorePoint:    '%bb.3'
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
-  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
-  - { id: 1, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 1, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
       isImmutable: false, isAliased: false, callee-saved-register: '', 
       callee-saved-restored: true }
 stack:           
 constants:       
 body:             |
   bb.0.entry:
     successors: %bb.4(0x40000000), %bb.1(0x40000000)
     liveins: $ecx, $edx

test/CodeGen/X86/win_coreclr_chkstk_liveins.mir

 # RUN: llc -verify-machineinstrs %s -run-pass prologepilog -mtriple=x86_64-pc-win32-coreclr -o - | FileCheck %s
 ...
 ---
 name:            main4k
 # CHECK-LABEL: name: main4k
 
 alignment:       4
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    8
 stack:
-  - { id: 0, size: 4096, alignment: 1, stack-id: 0 }
+  - { id: 0, size: 4096, alignment: 1, stack-id: default }
 body:             |
   bb.0.entry:
     $eax = IMPLICIT_DEF
     RET 0, killed $eax
 
   ; CHECK: bb.1.entry:
   ; CHECK:   liveins: $rdx
   ; CHECK: bb.2.entry:
   ; CHECK:   liveins: $rcx, $rdx
   ; CHECK: bb.3.entry:
   ; CHECK:   liveins: $rax
 ...

test/DebugInfo/AArch64/asan-stack-vars.mir

frameInfo:
   maxAlignment:    32
   adjustsStack:    true
   hasCalls:        true
   stackProtector:  '%stack.0.StackGuardSlot'
   maxCallFrameSize: 0
   localFrameSize:  144
 stack:           
   - { id: 0, name: StackGuardSlot, offset: -40, size: 8, alignment: 8, 
-      stack-id: 0, local-offset: -8 }
-  - { id: 1, name: self.addr, offset: -168, size: 8, alignment: 8, stack-id: 0, 
+      stack-id: default, local-offset: -8 }
+  - { id: 1, name: self.addr, offset: -168, size: 8, alignment: 8, stack-id: default,
       local-offset: -136, debug-info-variable: '!45', debug-info-expression: '!DIExpression()', 
       debug-info-location: '!47' }
-  - { id: 2, name: _cmd.addr, offset: -176, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 2, name: _cmd.addr, offset: -176, size: 8, alignment: 8, stack-id: default,
       local-offset: -144, debug-info-variable: '!48', debug-info-expression: '!DIExpression()', 
       debug-info-location: '!47' }
-  - { id: 3, name: MyAlloca, offset: -160, size: 96, alignment: 32, stack-id: 0, 
+  - { id: 3, name: MyAlloca, offset: -160, size: 96, alignment: 32, stack-id: default,
       local-offset: -128 }
-  - { id: 4, type: spill-slot, offset: -184, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 5, type: spill-slot, offset: -192, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 6, type: spill-slot, offset: -200, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 7, type: spill-slot, offset: -208, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 8, type: spill-slot, offset: -216, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 9, type: spill-slot, offset: -224, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 10, type: spill-slot, offset: -232, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 11, type: spill-slot, offset: -240, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 12, type: spill-slot, offset: -248, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 13, type: spill-slot, offset: -256, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 14, type: spill-slot, offset: -264, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 15, type: spill-slot, offset: -272, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 16, type: spill-slot, offset: -280, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 17, type: spill-slot, offset: -288, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 18, type: spill-slot, offset: -296, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 19, type: spill-slot, offset: -304, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 20, type: spill-slot, offset: -312, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 21, type: spill-slot, offset: -320, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 22, type: spill-slot, offset: -328, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 23, type: spill-slot, offset: -336, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 24, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 4, type: spill-slot, offset: -184, size: 8, alignment: 8, stack-id: default }
+  - { id: 5, type: spill-slot, offset: -192, size: 8, alignment: 8, stack-id: default }
+  - { id: 6, type: spill-slot, offset: -200, size: 8, alignment: 8, stack-id: default }
+  - { id: 7, type: spill-slot, offset: -208, size: 8, alignment: 8, stack-id: default }
+  - { id: 8, type: spill-slot, offset: -216, size: 8, alignment: 8, stack-id: default }
+  - { id: 9, type: spill-slot, offset: -224, size: 8, alignment: 8, stack-id: default }
+  - { id: 10, type: spill-slot, offset: -232, size: 8, alignment: 8, stack-id: default }
+  - { id: 11, type: spill-slot, offset: -240, size: 8, alignment: 8, stack-id: default }
+  - { id: 12, type: spill-slot, offset: -248, size: 8, alignment: 8, stack-id: default }
+  - { id: 13, type: spill-slot, offset: -256, size: 8, alignment: 8, stack-id: default }
+  - { id: 14, type: spill-slot, offset: -264, size: 8, alignment: 8, stack-id: default }
+  - { id: 15, type: spill-slot, offset: -272, size: 8, alignment: 8, stack-id: default }
+  - { id: 16, type: spill-slot, offset: -280, size: 8, alignment: 8, stack-id: default }
+  - { id: 17, type: spill-slot, offset: -288, size: 8, alignment: 8, stack-id: default }
+  - { id: 18, type: spill-slot, offset: -296, size: 8, alignment: 8, stack-id: default }
+  - { id: 19, type: spill-slot, offset: -304, size: 8, alignment: 8, stack-id: default }
+  - { id: 20, type: spill-slot, offset: -312, size: 8, alignment: 8, stack-id: default }
+  - { id: 21, type: spill-slot, offset: -320, size: 8, alignment: 8, stack-id: default }
+  - { id: 22, type: spill-slot, offset: -328, size: 8, alignment: 8, stack-id: default }
+  - { id: 23, type: spill-slot, offset: -336, size: 8, alignment: 8, stack-id: default }
+  - { id: 24, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$lr' }
-  - { id: 25, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 25, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$fp' }
-  - { id: 26, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 26, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x27' }
-  - { id: 27, type: spill-slot, offset: -32, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 27, type: spill-slot, offset: -32, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$x28' }
 body:             |
   bb.0.entry:
     liveins: $x0, $x1, $d0, $d1, $x27, $x28, $lr
   
     early-clobber $sp = frame-setup STPXpre killed $x28, killed $x27, $sp, -4 :: (store 8 into %stack.27), (store 8 into %stack.26)
     frame-setup STPXi killed $fp, killed $lr, $sp, 2 :: (store 8 into %stack.25), (store 8 into %stack.24)
     $fp = frame-setup ADDXri $sp, 16, 0

 tracksRegLiveness: true
 frameInfo:       
   stackSize:       16
   maxAlignment:    8
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 stack:           
-  - { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$lr' }
-  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$fp' }
 body:             |
   bb.0 (%ir-block.0):
     liveins: $lr
   
     early-clobber $sp = frame-setup STPXpre killed $fp, killed $lr, $sp, -2 :: (store 8 into %stack.1), (store 8 into %stack.0)
     frame-setup CFI_INSTRUCTION def_cfa_offset 16
     frame-setup CFI_INSTRUCTION offset $w30, -8
     frame-setup CFI_INSTRUCTION offset $w29, -16
     BL @__asan_init, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp
     BL @__asan_version_mismatch_check_v8, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp
     early-clobber $sp, $fp, $lr = frame-destroy LDPXpost $sp, 2 :: (load 8 from %stack.1), (load 8 from %stack.0)
     RET undef $lr
 
 ...

test/DebugInfo/AArch64/compiler-gen-bbs-livedebugvalues.mir

 tracksRegLiveness: true
 frameInfo:       
   stackSize:       32
   maxAlignment:    8
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 stack:           
-  - { id: 0, type: spill-slot, offset: -20, size: 4, alignment: 4, stack-id: 0 }
-  - { id: 1, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -20, size: 4, alignment: 4, stack-id: default }
+  - { id: 1, type: spill-slot, offset: -8, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$lr' }
-  - { id: 2, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 2, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$fp' }
 body:             |
   ; CHECK-LABEL: bb.0.entry:
   bb.0.entry:
     liveins: $w0, $lr
   
     $sp = frame-setup SUBXri $sp, 32, 0
     frame-setup STPXi killed $fp, killed $lr, $sp, 2 :: (store 8 into %stack.2), (store 8 into %stack.1)

test/DebugInfo/ARM/cfi-eof-prologue.mir

liveins:
   - { reg: '$r0' }
 frameInfo:       
   stackSize:       8
   maxAlignment:    4
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 stack:           
-  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$lr', callee-saved-restored: false }
-  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$r4' }
 body:             |
   bb.0.entry:
     frame-setup tPUSH 14, $noreg, killed $r4, killed $lr, implicit-def $sp, implicit $sp
     frame-setup CFI_INSTRUCTION def_cfa_offset 8
     frame-setup CFI_INSTRUCTION offset $lr, -4
     frame-setup CFI_INSTRUCTION offset $r4, -8
     DBG_VALUE debug-use $r0, debug-use $noreg, !33, !DIExpression(), debug-location !35
liveins:
   - { reg: '$r0' }
 frameInfo:       
   stackSize:       8
   maxAlignment:    4
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 stack:           
-  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$lr', callee-saved-restored: false }
-  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, stack-id: default,
       callee-saved-register: '$r4' }
 body:             |
   bb.0.entry:
     frame-setup tPUSH 14, $noreg, killed $r4, killed $lr, implicit-def $sp, implicit $sp
     frame-setup CFI_INSTRUCTION def_cfa_offset 8
     frame-setup CFI_INSTRUCTION offset $lr, -4
     frame-setup CFI_INSTRUCTION offset $r4, -8
     DBG_VALUE debug-use $r0, debug-use $noreg, !42, !DIExpression(), debug-location !43

test/DebugInfo/MIR/ARM/live-debug-values-reg-copy.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
 stack:           
   - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '$lr', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '$r11', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '$r5', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '$r4', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       
 body:             |
   bb.0.entry:
     successors: %bb.1(0x40000000), %bb.2(0x40000000)
   
     $sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r5, killed $r11, killed $lr
     frame-setup CFI_INSTRUCTION def_cfa_offset 16

test/DebugInfo/MIR/Mips/last-inst-bundled.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: condition, type: default, offset: -12, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$ra', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '$s0', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.2(0x30000000), %bb.1(0x50000000)
 
     $sp = ADDiu $sp, -32

test/DebugInfo/MIR/Mips/live-debug-values-reg-copy.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d25_64', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d25_64', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$d24_64', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$d24_64', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$ra_64', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$ra_64', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
   - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '$s0_64', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '$s0_64', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
   - id:              0
     value:           'double 1.012310e+01'
     alignment:       8
     isTargetSpecific: false
   - id:              1
     value:           'float 1.000000e+01'

test/DebugInfo/MIR/X86/debug-loc-0.mir

frameInfo:
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      []
 stack:
   - { id: 0, name: s1.addr, type: default, offset: 0, size: 8, alignment: 8,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       []
 body:             |
   bb.0.entry:
     MOV64mi32 %stack.0.s1.addr, 1, $noreg, 0, $noreg, 0 :: (store 8 into %ir.0)
     ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !10
     dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi, debug-location !10
     CALL64pcrel32 @"$S16resilient_struct4SizeVMa", csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax, implicit-def dead $rdx, debug-location !10
     ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !10
     RET 0, debug-location !12
 
 ...

test/DebugInfo/MIR/X86/kill-after-spill.mir

frameInfo:
   stackProtector:  ''
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: 0,
+  - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$rbx', callee-saved-restored: true }
-  - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: 0,
+  - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$r12', callee-saved-restored: true }
-  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: 0,
+  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$r13', callee-saved-restored: true }
-  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: 0,
+  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$r14', callee-saved-restored: true }
-  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0,
+  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$r15', callee-saved-restored: true }
-  - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0,
+  - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '', callee-saved-restored: true }
 stack:
   - { id: 0, name: '', type: spill-slot, offset: -64, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
   - { id: 1, name: '', type: spill-slot, offset: -60, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '',
       debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.9(0x30000000), %bb.1(0x50000000)
     liveins: $edi, $esi, $r15, $r14, $r13, $r12, $rbx
 

test/DebugInfo/MIR/X86/live-debug-values-reg-copy.mir

frameInfo:
   stackProtector:  ''
   maxCallFrameSize: 0
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:
-  - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0,
+  - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$rbx', callee-saved-restored: true }
-  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0,
+  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$rbp', callee-saved-restored: true }
 stack:
   - { id: 0, name: local1, type: default, offset: -28, size: 4, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:
 body:             |
   bb.0.entry:
     successors: %bb.1(0x40000000), %bb.2(0x40000000)
     liveins: $edi, $rbp, $rbx
 
     frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp

test/DebugInfo/MIR/X86/live-debug-values-restore.mir

frameInfo:
   cvBytesOfCalleeSavedRegisters: 48
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   localFrameSize:  0
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
-  - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$r12', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
-  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$r13', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
-  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
-  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
       callee-saved-register: '$r15', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
-  - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0, 
+  - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
       callee-saved-register: '$rbp', callee-saved-restored: true, debug-info-variable: '', 
       debug-info-expression: '', debug-info-location: '' }
 stack:           
   - { id: 0, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8, 
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true, 
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
       debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
 constants:       []
 body:             |
   bb.0.entry:
     successors: %bb.2(0x30000000), %bb.1(0x50000000)
     liveins: $rdi, $rbx, $r12, $r13, $r14, $r15, $rbp
   
     DBG_VALUE $rdi, $noreg, !13, !DIExpression(), debug-location !14

test/DebugInfo/X86/debug-loc-asan.mir

 frameInfo:       
   stackSize:       152
   offsetAdjustment: -160
   maxAlignment:    32
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0 }
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default }
 stack:           
-  - { id: 0, name: MyAlloca, offset: -96, size: 64, alignment: 32, stack-id: 0 }
-  - { id: 1, type: spill-slot, offset: -100, size: 4, alignment: 4, stack-id: 0 }
-  - { id: 2, type: spill-slot, offset: -112, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 3, type: spill-slot, offset: -120, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 4, type: spill-slot, offset: -128, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 5, type: spill-slot, offset: -136, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 6, type: spill-slot, offset: -144, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 7, type: spill-slot, offset: -145, size: 1, alignment: 1, stack-id: 0 }
-  - { id: 8, type: spill-slot, offset: -146, size: 1, alignment: 1, stack-id: 0 }
-  - { id: 9, type: spill-slot, offset: -152, size: 4, alignment: 4, stack-id: 0 }
+  - { id: 0, name: MyAlloca, offset: -96, size: 64, alignment: 32, stack-id: default }
+  - { id: 1, type: spill-slot, offset: -100, size: 4, alignment: 4, stack-id: default }
+  - { id: 2, type: spill-slot, offset: -112, size: 8, alignment: 8, stack-id: default }
+  - { id: 3, type: spill-slot, offset: -120, size: 8, alignment: 8, stack-id: default }
+  - { id: 4, type: spill-slot, offset: -128, size: 8, alignment: 8, stack-id: default }
+  - { id: 5, type: spill-slot, offset: -136, size: 8, alignment: 8, stack-id: default }
+  - { id: 6, type: spill-slot, offset: -144, size: 8, alignment: 8, stack-id: default }
+  - { id: 7, type: spill-slot, offset: -145, size: 1, alignment: 1, stack-id: default }
+  - { id: 8, type: spill-slot, offset: -146, size: 1, alignment: 1, stack-id: default }
+  - { id: 9, type: spill-slot, offset: -152, size: 4, alignment: 4, stack-id: default }
 body:             |
   bb.0.entry:
     liveins: $edi
   
     frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
     CFI_INSTRUCTION def_cfa_offset 16
     CFI_INSTRUCTION offset $rbp, -16
     $rbp = frame-setup MOV64rr $rsp

test/DebugInfo/X86/debug-loc-offset.mir

 alignment:       4
 tracksRegLiveness: true
 frameInfo:       
   stackSize:       8
   offsetAdjustment: -4
   maxAlignment:    4
   maxCallFrameSize: 0
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: 0 }
-  - { id: 1, size: 4, alignment: 16, stack-id: 0 }
+  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: default }
+  - { id: 1, size: 4, alignment: 16, stack-id: default }
 stack:           
-  - { id: 0, type: spill-slot, offset: -12, size: 4, alignment: 4, stack-id: 0 }
+  - { id: 0, type: spill-slot, offset: -12, size: 4, alignment: 4, stack-id: default }
 body:             |
   bb.0.entry:
     frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
     CFI_INSTRUCTION def_cfa_offset 8
     CFI_INSTRUCTION offset $ebp, -8
     $ebp = frame-setup MOV32rr $esp
     CFI_INSTRUCTION def_cfa_register $ebp
     frame-setup PUSH32r undef $eax, implicit-def $esp, implicit $esp

 frameInfo:       
   stackSize:       28
   offsetAdjustment: -24
   maxAlignment:    4
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 4
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: 0 }
-  - { id: 1, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
+  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: default }
+  - { id: 1, size: 4, alignment: 16, stack-id: default, isImmutable: true }
 stack:           
-  - { id: 0, name: z, offset: -12, size: 4, alignment: 4, stack-id: 0, 
+  - { id: 0, name: z, offset: -12, size: 4, alignment: 4, stack-id: default,
       debug-info-variable: '!22', debug-info-expression: '!DIExpression()', 
       debug-info-location: '!23' }
-  - { id: 1, type: spill-slot, offset: -16, size: 4, alignment: 4, stack-id: 0 }
+  - { id: 1, type: spill-slot, offset: -16, size: 4, alignment: 4, stack-id: default }
 body:             |
   bb.0.entry:
     frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
     CFI_INSTRUCTION def_cfa_offset 8
     CFI_INSTRUCTION offset $ebp, -8
     $ebp = frame-setup MOV32rr $esp
     CFI_INSTRUCTION def_cfa_register $ebp
     $esp = frame-setup SUB32ri8 $esp, 24, implicit-def dead $eflags

test/DebugInfo/X86/dw_op_minus.mir

 tracksRegLiveness: true
 frameInfo:       
   stackSize:       24
   maxAlignment:    8
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 stack:           
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 1, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: 0 }
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default }
+  - { id: 1, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default }
 body:             |
   bb.0.entry:
     $rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags
     CFI_INSTRUCTION def_cfa_offset 32
     renamable $rax = MOV64rm $rip, 1, $noreg, target-flags(x86-gottpoff) @__safestack_unsafe_stack_ptr, $noreg :: (load 8 from got)
     renamable $rcx = MOV64rm renamable $rax, 1, $noreg, 0, $fs :: (dereferenceable load 8 from @__safestack_unsafe_stack_ptr)
     DBG_VALUE renamable $rcx, 0, !9, !DIExpression(DW_OP_constu, 400, DW_OP_minus), debug-location !15
     $rdx = MOV64rr $rcx

test/DebugInfo/X86/live-debug-vars-dse.mir

frameInfo:
   hasOpaqueSPAdjustment: false
   hasVAStart:      false
   hasMustTailInVarArgFunc: false
   savePoint:       ''
   restorePoint:    ''
 fixedStack:      
 stack:           
   - { id: 0, name: x.addr, type: default, offset: 0, size: 4, alignment: 4, 
-      stack-id: 0, callee-saved-register: '', debug-info-variable: '',
+      stack-id: default, callee-saved-register: '', debug-info-variable: '',
       debug-info-expression: '', debug-info-location: '' }
 constants:       
 body:             |
   bb.0.entry:
     liveins: $ecx
   
     %0 = COPY $ecx
     MOV32mr %stack.0.x.addr, 1, _, 0, _, %0 :: (store 4 into %ir.x.addr)

test/DebugInfo/X86/pr19307.mir

 frameInfo:       
   stackSize:       40
   offsetAdjustment: -32
   maxAlignment:    8
   adjustsStack:    true
   hasCalls:        true
   maxCallFrameSize: 0
 fixedStack:      
-  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0 }
+  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default }
 stack:           
-  - { id: 0, name: offset.addr, offset: -24, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 0, name: offset.addr, offset: -24, size: 8, alignment: 8, stack-id: default,
       debug-info-variable: '!41', debug-info-expression: '!DIExpression()', 
       debug-info-location: '!42' }
-  - { id: 1, name: limit.addr, offset: -32, size: 8, alignment: 8, stack-id: 0, 
+  - { id: 1, name: limit.addr, offset: -32, size: 8, alignment: 8, stack-id: default,
       debug-info-variable: '!43', debug-info-expression: '!DIExpression()', 
       debug-info-location: '!42' }
-  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: 0 }
-  - { id: 3, type: spill-slot, offset: -48, size: 8, alignment: 8, stack-id: 0 }
+  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default }
+  - { id: 3, type: spill-slot, offset: -48, size: 8, alignment: 8, stack-id: default }
 body:             |
   bb.0.entry:
     liveins: $rdi, $rsi, $rdx
   
     frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
     CFI_INSTRUCTION def_cfa_offset 16
     CFI_INSTRUCTION offset $rbp, -16
     $rbp = frame-setup MOV64rr $rsp

test/DebugInfo/X86/prolog-params.mir

--- |
   !27 = !DILocalVariable(name: "local2", scope: !7, file: !1, line: 7, type: !10)
   !28 = !DILocation(line: 5, column: 21, scope: !7)
 
 ...
 ---
 name:            foo
 tracksRegLiveness: true
 fixedStack:
-  - { id: 0, type: default, offset: 16, size: 4, alignment: 16, stack-id: 0,
+  - { id: 0, type: default, offset: 16, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
-  - { id: 1, type: default, offset: 8, size: 4, alignment: 8, stack-id: 0,
+  - { id: 1, type: default, offset: 8, size: 4, alignment: 8, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
-  - { id: 2, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
+  - { id: 2, type: default, offset: 0, size: 4, alignment: 16, stack-id: default,
       isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
 stack:
   - { id: 0, name: arr, type: default, offset: 0, size: 8, alignment: 4,
-      stack-id: 0, callee-saved-register: '', callee-saved-restored: true }
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true }
 body:             |
   bb.0.entry:
     DBG_VALUE $edi, $noreg, !18, !DIExpression(), debug-location !28
     DBG_VALUE $esi, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !28
     DBG_VALUE $rdx, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 64, 64), debug-location !28
     DBG_VALUE $ecx, $noreg, !20, !DIExpression(), debug-location !28
     DBG_VALUE $r8d, $noreg, !21, !DIExpression(), debug-location !28
     DBG_VALUE %fixed-stack.2, 0, !23, !DIExpression(), debug-location !28